View source for Engineering:History of the aircraft carrier

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[[File:Flightdeck of HMS Formidable.jpg|thumb|300px|Flight deck of {{HMS|Formidable|67|6}} with battleship {{HMS|Warspite|03|6}} in background (right), operations off Madagascar, April 1942]]

'''Aircraft carriers''' are [[Engineering:Warship|warship]]s that evolved from balloon-carrying wooden vessels into nuclear-powered vessels carrying scores of fixed- and rotary-wing aircraft. Since their introduction they have allowed naval forces to project air power great distances without having to depend on local bases for staging aircraft operations.

[[Engineering:Balloon carrier|Balloon carrier]]s were the first ships to deploy manned aircraft, used during the 19th and early 20th century, mainly for observation purposes. The advent of fixed-wing aircraft in 1903 was followed in 1910 by the first flight from the deck of a US Navy [[Engineering:Cruiser|cruiser]]. [[Engineering:Seaplane|Seaplane]]s and seaplane tender support ships, such as {{HMS|Engadine|1911|6}}, followed. The development of flat top vessels produced the first large fleet ships. This evolution was well underway by the early to mid-1920s, resulting in the commissioning of ships such as ''Hōshō'' (1922), {{HMS|Hermes|95|6}} (1924),<ref>Note: three generations of Royal Navy aircraft carriers named HMS ''Hermes'' are mentioned in this article: {{HMS|Hermes|1898}}, {{HMS|Hermes|95|6}} (1924), and {{HMS|Hermes|R12|6}} (1959),</ref> Béarn (1927), and the {{sclass-|Lexington|aircraft carrier|2}}s (1927).

Most early aircraft carriers were conversions of ships that were laid down (or had even served) as different ship types: cargo ships, cruisers, battlecruisers, or battleships. During the 1920s, several navies started ordering and building aircraft carriers that were specifically designed as such. This allowed the design to be specialized to their future role, and resulted in superior ships. During the Second World War, these ships would become the backbone of the carrier forces of the US, British, and Japanese navies, known as fleet carriers.

[[Social:World War II|World War II]] saw the first large-scale use of aircraft carriers and induced further refinement of their launch and recovery cycle leading to several design variants. The USA built small [[Engineering:Escort carrier|escort carrier]]s, such as {{USS|Bogue|CVE-9|6}}, as a stop-gap measure to provide air support for convoys and amphibious invasions. Subsequent light aircraft carriers, such as {{USS|Independence|CVL-22|6}}, represented a larger, more "militarized" version of the escort carrier concept. Although the light carriers usually carried the same size air groups as escort carriers, they had the advantage of higher speed as they had been converted from cruisers under construction.

==Early history - balloon and seaplane carriers==
[[File:balloon barge.jpg|thumb|right|The Union Army balloon ''Washington'' aboard the Navy barge {{USS|George Washington Parke Custis|1861|2}}]]
[[File:Samuel Pierpont Langley - Potomac experiment 1903.jpeg|thumb|left|[[Biography:Samuel Langley|Samuel Langley]]'s experiment flying the (Langley Aerodrome) off a houseboat in 1903 failed with it plunging into the Potomac River.]]

The earliest recorded instance of using a ship for airborne operations occurred in 1806, when Lord Cochrane of the Royal Navy launched kites from the 32-gun frigate {{HMS|Pallas|1804|6}} in order to drop propaganda leaflets.<ref>[https://books.google.co.uk/books?id=Z-us-l3qOVwC&pg=PA96&dq=pallas+kites&as_brr=3&client=firefox-a ''Military Ballooning During the Early Civil War''], p 96, F. Stansbury Haydon, JHU Press, 2000, {{ISBN|0-8018-6442-9}}</ref> The proclamations against Napoleon Bonaparte, written in French, were attached to kites, and the kite strings were set alight; when the strings had burned through, the leaflets landed on French soil.<ref>[https://books.google.co.uk/books?id=nScG9dnSR5QC&pg=PA12&dq=pallas+kites&as_brr=3&client=firefox-a ''Chambers's Supplementary Reader''], p 12, W. and R. Chambers, BiblioBazaar, 2008, {{ISBN|0-554-87195-5}}</ref>

===Balloon carriers===
Just over 40 years later on 12 July 1849,<ref>{{cite web|url=http://www.sandcastlevi.com/sea/carriers/cvchap1a.htm |title=Carriers: Airpower at Sea - The Early Years / Part 1 |accessdate=2007-08-03 |first=Arnold E. | last= van Beverhoudt, Jr. |date=2003-01-01 |work=sandcastlevi.com |publisher=Sandcastle VI }}</ref> the Austrian Navy ship {{SMS|Vulcano}} was used for launching incendiary balloons. A number of small [[Engineering:Hot air balloon#Montgolfier|Montgolfiere hot air ballons]] were launched with the intention of dropping bombs on Venice. Although the attempt largely failed due to contrary winds which drove the balloons back over the ship, one bomb did land on the city.<ref>[https://books.google.co.uk/books?id=7pS1QpH8FRgC&pg=PA10&dq=Vulcano+balloon+venice&as_brr=3&client=firefox-a ''Military Aircraft, Origins to 1918''], p 10, Justin D. Murphy, ABC-CLIO, 2005, {{ISBN|1-85109-488-1}}</ref>

Later, during the American Civil War, about the time of the Peninsula Campaign, gas-filled balloons were used to perform reconnaissance on Confederate positions. The battles soon turned inland into the heavily forested areas of the Peninsula, however, where balloons could not travel. A coal barge, {{USS|George Washington Parke Custis|1861|6}}, was cleared of all deck rigging to accommodate the gas generators and apparatus of balloons. From the barge Professor Thaddeus S. C. Lowe, Chief Aeronaut of the Union Army Balloon Corps, made his first ascents over the Potomac River and telegraphed claims of the success of the first aerial venture ever made from a water-borne vessel. Other barges were converted to assist with the other military balloons transported about the eastern waterways, but none of these Civil War craft ever took to the high seas.

Balloons launched from ships led to the development of [[Engineering:Balloon carrier|balloon carrier]]s, or balloon tenders, during [[Social:World War I|World War I]], by the navies of Great Britain, France, Germany, Italy, Russia, and Sweden. About ten such "balloon tenders" were built, their main objective being aerial observation posts. These ships were either decommissioned or converted to seaplane tenders after the war.

===Seaplane carriers===
[[File:CanardVoisinJune1912.jpg|thumb|The first seaplane carrier, the French ''Foudre'' (right, with hangar and crane), with one of her ''Canard Voisin'' seaplanes taking off, during tactical exercises in June 1912]]
The invention of the [[Engineering:Seaplane|seaplane]] in March 1910, with the French [[Engineering:Fabre Hydravion|Fabre Hydravion]], led to development of the earliest ship designed as an ''aircraft carrier'', albeit limited to aircraft equipped with floats, in December 1911 with the French Navy ''Foudre'', the first seaplane carrier. Commissioned as a seaplane tender, and carrying seaplanes under hangars on the main deck, from where they were lowered onto the sea with a crane, she participated in tactical exercises in the Mediterranean in 1912. ''Foudre'' was further modified in November 1913 with a 10-meter flat deck to launch her seaplanes.<ref>[http://www.hazegray.org/navhist/carriers/france.htm#foud Description] and [http://www.hazegray.org/navhist/carriers/images/europe/foudre-2.jpg photograph] of ''Foudre''</ref>

{{HMS|Hermes|1898|6}}, temporarily converted as an experimental seaplane carrier in April–May 1913, was also one of the first seaplane carriers, and the first experimental seaplane carrier of the Royal Navy. She was originally laid down as a merchant ship, but was converted on the building stocks to be a seaplane carrier for a few trials in 1913, before being converted again to a cruiser, and back again to a seaplane carrier in 1914. She was sunk by a German submarine in October 1914. The first seaplane tender of the US Navy was the {{USS|Mississippi|BB-23|6}}, converted to that role in December 1913.<ref>{{cite web|url=http://www.hazegray.org/navhist/carriers/us_sea1.htm |title=First US seaplane carrier, the USS ''Mississippi'' |publisher=Hazegray.org |date= |accessdate=2009-01-30}}</ref>
[[File:Wakamiya.jpg|thumb|The Japanese seaplane carrier {{Ship|Japanese seaplane carrier|Wakamiya||2}} conducted the world's first naval-launched air raids in September 1914.]]
In September 1914, during [[Social:World War I|World War I]], in the Battle of Tsingtao, the Imperial Japanese Navy seaplane carrier ''Wakamiya'' conducted the world's first successful naval-launched air raids.<ref>Wakamiya is "credited with conducting the first successful carrier air raid in history"[http://www.globalsecurity.org/military/world/japan/index.html Source:GlobalSecurity.org]</ref><ref>"Sabre et pinceau", Christian Polak, p. 92.</ref> It lowered four Maurice Farman seaplanes into the water using its crane. These seaplanes later took off to bombard German forces, and were retrieved back from the surface afterwards.<ref>[http://www.globalsecurity.org/military/world/japan/wakamiya-av.htm IJN Wakamiya Aircraft Carrier]</ref>

On the Western front the first naval air raid occurred on 25 December 1914 when twelve seaplanes from {{HMS|Engadine|1911|6}}, {{HMS|Riviera|3=2}} and {{HMS|Empress|1914|2}} (cross-channel steamers converted into seaplane carriers) attacked the Zeppelin base at Cuxhaven.<ref>Barry Watts and Williamson Murray, "Military Innovation in Peacetime," in {{cite book |title= Military Innovation in the Interwar Period|edition=|editor1-first= Williamson|editor1-last= Murray|editor2-first= Allan R|editor2-last= Millet |year= 1996|publisher= Cambridge University Press|location= New York|isbn= 0-521-63760-0|page= 385}}</ref> The attack was not a complete success, although a German warship was damaged; nevertheless the raid demonstrated in the European theatre the feasibility of attack by ship-borne aircraft and showed the strategic importance of this new weapon.

The Russians also were quite innovative in their use of seaplane carriers in the Black Sea theatre of World War I.<ref name= halpern>{{cite book| last = Halpern| first = Paul G.| title = A Naval History of World War I| publisher = Naval Institute Press| date = 11 October 2012| url = https://books.google.com/?id=wK4_6LF60GsC&dq=| isbn = 9781612511726}}</ref>

Many cruisers and [[Engineering:Capital ship|capital ship]]s of the inter-war years often carried a catapult-launched seaplane for reconnaissance and spotting the fall of shot. Such seaplanes were launched by a catapult and recovered by crane from the water after landing. They were successful even during World War II. There were many notable successes early in the war, such as {{HMS|Warspite|03|6}}'s float-equipped [[Engineering:Fairey Swordfish|Swordfish]] during the Second Battle of Narvik in 1940, which spotted for the guns of the British warships, helping to sink seven German destroyers, and sank the submarine {{GS|U-64|1939|6}} with bombs.<ref name="Green V6 p90-91">{{cite book |title=War Planes of the Second World War: Volume Six: Floatplanes |last=Green |first= William|year=1962 |publisher=Macdonald |location=London |isbn= |pages=90–91 }}</ref> The Japanese [[Engineering:Nakajima A6M2-N|Nakajima A6M2-N]] "Rufe" floatplane, was derived from the Zero.

==Genesis of the flat-deck carrier==
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| style="text-align: left;" | "An airplane-carrying vessel is indispensable. These vessels will be constructed on a plan very different from what is currently used. First of all the deck will be cleared of all obstacles. It will be flat, as wide as possible without jeopardizing the nautical lines of the hull, and it will look like a landing field."
|-
| style="text-align: left;" | [[Biography:Clément Ader|Clément Ader]], ''[[Social:L'Aviation Militaire|L'Aviation Militaire]]'', 1909
(See note<ref>Clement Ader on the structure of the aircraft carrier:<br />
"An airplane-carrying vessel is indispensable. These vessels will be constructed on a plan very different from what is currently used. First of all the deck will be cleared of all obstacles. It will be flat, as wide as possible without jeopardizing the nautical lines of the hull, and it will look like a landing field." Military Aviation, p35<br />
On stowage:<br />
"Of necessity, the airplanes will be stowed below decks; they would be solidly fixed anchored to their bases, each in its place, so they would not be affected with the pitching and rolling. Access to this lower decks would be by an elevator sufficiently long and wide to hold an airplane with its wings folded. A large, sliding trap would cover the hole in the deck, and it would have waterproof joints, so that neither rain nor seawater, from heavy seas could penetrate below." Military Aviation, p36<br />
On the technique of landing:<br />
"The ship will be headed straight into the wind, the stern clear, but a padded bulwark set up forward in case the airplane should run past the stop line" Military Aviation, p37.
</ref> for additional quotes.)
|}
As heavier-than-air aircraft developed in the early 20th century, various navies began to take an interest in their potential use as scouts for their big gun warships. In 1909 the French inventor [[Biography:Clément Ader|Clément Ader]] published in his book ''[[Social:L'Aviation Militaire|L'Aviation Militaire]]'' the description of a ship to operate airplanes at sea, with a flat flight deck, an island [[Earth:Superstructure|superstructure]], deck elevators and a hangar bay. That year the US Naval Attaché in Paris sent a report on his observations.<ref>{{cite web|url=http://www.sandcastlevi.com/sea/carriers/cvchap1b.htm |title=Carriers: Airpower at Sea - The Early Years / Part 2 |accessdate=19 October 2017 |first=Arnold E., Jr. |last=van Beverhoudt |date=2003-01-01 |work=sandcastlevi.com |publisher=Sandcastle VI }}</ref>

[[File:First airplane takeoff from a warship.jpg|thumb|left|Eugene Ely takes off from {{USS|Birmingham|CL-2|6}}, 14 November 1910.]]
[[File:First carrier landing 1911-01-18.jpg|thumb|right|Eugene Ely makes the first carrier landing on {{USS|Pennsylvania|ACR-4|6}}, 18 January 1911.]]
A number of experimental flights were made to test the concept. Eugene Ely was the first pilot '''to launch''' from a '''stationary''' ship in November 1910. He took off from a structure fixed over the forecastle of the US [[Engineering:Armored cruiser|armored cruiser]] {{USS|Birmingham|CL-2|6}} at Hampton Roads, Virginia and landed nearby on Willoughby Spit after some five minutes in the air.

On 18 January 1911, he became the first pilot '''to land''' on a '''stationary''' ship. He took off from the Tanforan racetrack and landed on a similar temporary structure on the aft of {{USS|Pennsylvania|ACR-4|6}} anchored at the {{wipe|San Francisco}} waterfront—the improvised braking system of sandbags and ropes led directly to the arrestor hook and wires described below. His aircraft was then turned around and he was able to take off again.

Commander Charles Rumney Samson, Royal Navy, became the first airman '''to take off''' from a '''moving''' warship, on 9 May 1912. He took off in a [[Engineering:Short S.38|Short S.38]] from the battleship {{HMS|Hibernia|1905|6}} while she steamed at {{convert|15|kn|mph km/h|lk=in|abbr=on}} during the Royal Fleet Review at Weymouth, England.<ref name="BandJ p60">{{cite book | last = Barnes C.H. & James D.N |  title =Shorts Aircraft since 1900 | publisher =Putnam | year = 1989 | location =London | page =60 | url = | doi = | isbn = 0-85177-819-4}}</ref>

===Flat-deck carriers in World War I===
{{HMS|Ark Royal|1914|6}} was arguably the first active aircraft carrier, as it carried armed seaplanes for use in combat and military operations. She was originally laid down as a merchant ship, but was converted on the building stocks to be a hybrid airplane/seaplane carrier with a launch platform. Launched on 5 September 1914, she served in the Dardanelles campaign and throughout World War I. The ship proved to be too slow to work with the Grand Fleet and for operations in the North Sea in general, so ''Ark Royal'' was ordered to the Mediterranean in mid-January 1915 to support the Gallipoli campaign.<ref name=f8>Friedman, p. 28</ref> 

{{HMS|Furious|47|6}} was the first ship to be designed with the same basic features as modern aircraft carriers, as it was the first aircraft carrier to be equipped with a flight deck for airplanes although its initial flight decks were in two portions and therefore were not continuously full-length with the ship. This ship was rebuilt in 1925 with a full-length flight deck, and served in combat operations during [[Social:World War II|World War II]]. Since {{HMS|Ark Royal|1914|6}} was a seaplane carrier, it had no actual flight deck; the planes that it carried would take off and land on the sea, and would then be hoisted aboard by shipboard cranes. 

[[File:SSZ airship aboard HMS Furious 1918 IWM Q 20640.jpg|thumb|left|{{HMS|Furious|47|6}} in 1918 with flight decks fore and aft of the superstructure]]
During World War I the Royal Navy used {{HMS|Furious|47|6}} to experiment with the use of wheeled aircraft on ships. This ship was reconstructed three times between 1915 and 1925: first, while still under construction, it was modified to receive a flight deck on the fore-deck; in 1917 it was reconstructed with separate flight decks fore and aft of the superstructure; then finally, after the war, it was heavily reconstructed with a three-quarter length main flight deck, and a lower-level takeoff-only flight deck on the fore-deck.

On 2 August 1917, Squadron Commander E.H. Dunning, Royal Navy, landed his [[Engineering:Sopwith Pup|Sopwith Pup]] aircraft on {{HMS|Furious|47|6}} in Scapa Flow, Orkney, becoming the first man '''to land''' a plane on a '''moving''' ship.<ref name="furious"/> He was killed 5 days later during another landing on ''Furious''.<ref name="furious">{{cite web | title = HMS Furious 1917 | work = Royal Navy | publisher = RN official web site | url = http://www.royal-navy.mod.uk/server/show/conWebDoc.880/changeNav/3533 | accessdate = 10 January 2009 | url-status = dead| archiveurl = https://web.archive.org/web/20080613210138/http://www.royal-navy.mod.uk/server/show/conWebDoc.880/changeNav/3533 | archivedate = 13 June 2008 | df =  }}</ref>

Of carrier operations mounted during the war, one of the most successful took place on 19 July 1918 during the Tondern Raid when seven [[Engineering:Sopwith Camel|Sopwith Camel]]s launched from HMS ''Furious'' attacked the German Zeppelin base at Tondern, with two {{convert|50|lb|kg|abbr=on}} bombs each. Several airships and balloons were destroyed, but as the carrier had no method of recovering the aircraft, two of the pilots ditched their aircraft in the sea alongside the carrier while the others headed for neutral {{wipe|Denmark}}. This was the first ever carrier-launched airstrike.<ref>Probert, p. 46</ref>

==Inter-war years==
The Washington Naval Treaty of 1922 placed strict limits on the tonnages of battleships and [[Engineering:Battlecruiser|battlecruiser]]s for the major naval powers after World War I, as well as not only a limit on the total tonnage for carriers, but also an upper limit of 27000 tons for each ship. Although exceptions were made regarding the maximum ship tonnage, fleet units counted, experimental units did not, the total tonnage could not be exceeded. However, while all of the major navies were over-tonnage on battleships, they were all considerably under-tonnage on aircraft carriers. Consequently, many battleships and battlecruisers under construction (or in service) were converted into aircraft carriers.

===HMS ''Argus'': the first full-length flat deck===
[[File:H42235.jpg|thumb|upright|The first full-length flat deck, {{HMS|Argus|I49|6}} in 1918]]
The first ship to have a full-length flat deck was {{HMS|Argus|I49|6}}, the conversion of which was completed in September 1918. The United States Navy did not follow suit until 1920, when the conversion of {{USS|Langley|CV-1|6}}, an experimental ship which did not count against America's carrier tonnage, was completed. The first American fleet carriers would not enter service until November 1927 when {{USS|Saratoga|CV-3|6}} of the {{sclass-|Lexington|aircraft carrier|0}} was commissioned. The [[Engineering:Lead ship|lead ship]] of the class, {{USS|Lexington|CV-2|6}}, was commissioned the following month.

===''Hōshō'': the first purpose-built aircraft carrier commissioned===
[[File:Japanese aircraft carrier Hosho cropped.jpg|thumb|The IJN's 1922 {{Ship|Japanese aircraft carrier|Hōshō||2}} was the first purpose-built aircraft carrier to be commissioned.<ref name=globalsecurity/>]]
The first purpose-designed aircraft carrier to be '''laid down''' was {{HMS|Hermes|95|6}} (1924) in 1918. Japan began work on {{Ship|Japanese aircraft carrier|Hōshō||2}} the following year. In December 1922, ''Hōshō'' became the first to be '''commissioned''', while ''Hermes'' was commissioned in February 1924.<ref name=globalsecurity>"Hōshō was a carrier from the keel, the first of its kind completed in any navy of the world" Scot MacDonald [http://www.history.navy.mil/download/car-7.pdf US Navy History: ''Evolution of Aircraft Carriers'']</ref><ref>"The Imperial Japanese Navy was a pioneer in naval aviation, having commissioned the world's first built-from-the-keel-up carrier, the ''Hosho''." [http://www.globalsecurity.org/military/world/japan/ijn.htm GlobalSecurity: ''Carrier Hosho''].</ref>

===HMS ''Hermes'' (1924): the first off-set control tower===
[[File:HMS Hermes (95) off Yantai China c1931.jpeg|thumb|{{HMS|Hermes|95|6}} (1924)]]
The design of HMS ''Hermes'' (1924) preceded and influenced that of ''Hōshō'', and its construction actually began earlier, but numerous tests, experiments and budget considerations delayed its commission. The long gestation of ''Hermes'' resulted finally in the first aircraft carrier to display the two most distinctive features of a modern aircraft carrier: the full-length flight deck and the starboard-side control tower island. With the exception of the squared-off flight deck prow and angled flight deck of later carriers, ''Hermes'' was the first to display the main features of the classic silhouette and plan layout of the great majority of aircraft carriers produced over the next century.

HMS ''Hermes'' (1924) was commissioned two days earlier than a sister aircraft carrier, {{HMS|Eagle|1918|6}}. Like ''Hermes'', ''Eagle'' had a full-length flight deck and a starboard-side control tower island. Unlike ''Hermes'', however, ''Eagle'' was a converted battleship and had a less integrated design and appearance than the purpose-designed ''Hermes''.

==== {{Visible anchor|Hurricane bow}} ====
A "hurricane bow" is a bow sealed up to the flight deck, first seen on {{HMS|Hermes|95|6}} (1924). The American ''Lexington''-class carriers also featured this when they entered service in 1927. Combat experience proved it to be by far the most useful configuration for the bow of the ship among others that were tried, including an additional flying-off deck and an anti-aircraft battery.{{Citation needed|date=April 2008}} The latter was the most common American configuration during World War II, seen in the {{sclass-|Essex|aircraft carrier|0}} (the "long-hull" variant),{{Citation needed|date=April 2008}} and it was not until after the war when a majority of American carriers incorporated the hurricane bow. The first Japanese carrier with a hurricane bow was {{Ship|Japanese aircraft carrier|Taihō||2}}.

==Important innovations just before and during World War II==
[[File:Japanese aircraft carrier Taiho 02.jpg|thumb|right|Japanese carrier ''Taihō'' had a hurricane bow.]]

By the late 1930s, carriers around the world typically carried three types of aircraft: torpedo bombers, also used for conventional bombings and reconnaissance; dive bombers, also used for reconnaissance (in the U.S. Navy, aircraft of this type were known as "scout bombers"); and fighters for fleet defence and bomber escort duties. Because of the restricted space on aircraft carriers, all these aircraft were of small, single-engined types, usually with [[Engineering:Folding wing|folding wing]]s to facilitate storage. In the late 1930s, the RN also developed the concept of the armoured flight deck, enclosing the hangar in an armoured box. The lead ship of this new type, {{HMS|Illustrious|87|6}}, commissioned in 1940.

===Light aircraft carriers===
[[File:USS Saratoga (CV-3) landing planes on 6 June 1935 (80-G-651292).jpg|thumb|right|{{USS|Saratoga|CV-3|6}} c. 1935]]
Prior to the beginning of the war, President Franklin D. Roosevelt noticed that no new aircraft carriers were expected to enter the fleet before 1944, and proposed the conversion of several {{sclass-|Cleveland|cruiser|0}} cruiser hulls that had already been laid down. They were intended to serve as additional fast carriers, as escort carriers did not have the requisite speed to keep up with the fleet carriers and their escorts. The actual U.S. Navy classification was small aircraft carrier (CVL), not light. Prior to July 1943, they were just classified as aircraft carriers (CV).<ref>CVL&mdash;Small Aircraft Carriers, Naval Historical Center, http://www.history.navy.mil/photos/shusn-no/cvl-no.htm. Retrieved 22 September 2006.</ref>

The Royal Navy made a similar design which served both Britain and the [[Organization:Commonwealth of Nations|Commonwealth]] countries after World War II. One of these carriers, {{HMS|Hermes|R12|6}} (1959), was in use as India's {{INS|Viraat 
|R22|6}}, until it was decommissioned in 2017.

===Escort carriers and merchant aircraft carriers===
To protect Atlantic convoys, the British developed what they called Merchant Aircraft Carriers, which were merchant ships equipped with a flat deck for six aircraft. These operated with civilian crews, under merchant colors, and carried their normal cargo besides providing air support for the convoy. As there was no lift or hangar, aircraft maintenance was limited and the aircraft spent the entire trip sitting on the deck.

These served as a stop-gap measure until dedicated escort carriers (CVE) could be built in the U.S. About a third of the size of a fleet carrier, they carried between 20 and 30 aircraft, mostly for anti-submarine duties. Over 100 were built or converted from merchantmen. Escort carriers were built in the US from two basic hull designs: one from a merchant ship, and the other from a slightly larger, slightly faster tanker. Besides defending convoys, these were used to transport aircraft across the ocean. Nevertheless, some participated in the battles to liberate the {{wipe|Philippines}}, notably the Battle off Samar in which six escort carriers and their escorting destroyers aggressively attacked five Japanese battleships and bluffed them into retreating.

===Catapult aircraft merchantmen===
As an emergency stop-gap before sufficient merchant aircraft carriers became available, the British provided air cover for convoys using Catapult aircraft merchantman (CAM ships). CAM ships were merchant vessels equipped with an aircraft, usually a battle-weary [[Engineering:Hawker Hurricane|Hawker Hurricane]], launched by a catapult. Once launched, the aircraft could not land back on the deck and had to ditch in the sea if it was not within range of land. In over two years, fewer than 10 launches were ever made, yet these flights did have some success: 6 bombers for the loss of a single pilot.

==World War II==
[[File:HMS Audacity (D10).jpg|thumb|right|{{HMS|Audacity|D10|6}} was the world's first escort carrier.]]
[[File:Aerial photography of HMS Victorious.jpg|thumb|right|{{HMS|Victorious|R38|6}} during World War II]]
[[File:USS Saratoga (CV-3), USS Enterprise (CV-6), USS Hornet (CV-12) and USS San Jacinto (CVL-30) docked at Alameda in September 1945 (80-G-701512).jpg|thumb|Four US Navy carriers right after the war, showing size and length differences: {{USS|Saratoga|CV-3|2}} (bottom), an early battlecruiser conversion; {{USS|Enterprise|CV-6|2}} (2nd from bottom), an early fleet carrier; {{USS|Hornet|CV-12|2}} (3rd from bottom), a war-time built {{sclass-|Essex|aircraft carrier|0}} carrier; and {{USS|San Jacinto|CVL-30|2}} (top), a light carrier based on a cruiser hull.]]
Aircraft carriers played a significant role in [[Social:World War II|World War II]]. With seven aircraft carriers afloat, the Royal Navy had a considerable numerical advantage at the start of the war as neither the Germans nor the Italians had carriers of their own.<ref>{{cite book |title=World War Two: A Military History |last=Black |first=Jeremy |year= 2003|publisher=Routledge |location= |isbn=0-415-30534-9 |page=17}}</ref> However, the vulnerability of carriers compared to traditional battleships when forced into a gun-range encounter was quickly illustrated by the sinking of {{HMS|Glorious}} by German battlecruisers during the Norwegian campaign in 1940. The first British warship lost in the war was {{HMS|Courageous|50|6}} sunk by {{GS|U-29|1936|2}} on 17 September 1939.

The versatility of the carrier was demonstrated in November 1940 when HMS ''Illustrious'' launched a long-range strike on the Italian fleet at Taranto signalling the beginning of the effective mobile aircraft strikes, by short-ranged aircraft. This operation incapacitated three of the six battleships in the harbour at a cost of two of the 21 attacking [[Engineering:Fairey Swordfish|Fairey Swordfish]] torpedo bombers. Carriers also played a major part in reinforcing Malta, both by transporting planes and by defending convoys sent to supply the besieged island. The use of carriers prevented the Italian Navy and land-based German aircraft from dominating the Mediterranean theatre.

In the Atlantic, aircraft from {{HMS|Ark Royal|91|6}} and {{HMS|Victorious|R38|6}} were responsible for slowing the German battleship {{Ship|German battleship|Bismarck||2}} during May 1941. Later in the war, escort carriers proved their worth guarding convoys crossing the Atlantic and Arctic oceans.

Germany and Italy also started with the construction or conversion of several aircraft carriers, but with the exception of the nearly finished {{Ship|German aircraft carrier|Graf Zeppelin||2}}, no ship was launched.

World War II in the [[Earth:Pacific Ocean|Pacific Ocean]] involved clashes between aircraft carrier fleets. {{wipe|Japan}} started the war with ten aircraft carriers, the largest and most modern carrier fleet in the world at that time. There were seven American aircraft carriers at the beginning of the hostilities, although only three of them were operating in the Pacific.

Drawing on the 1939 Japanese development of shallow-water modifications for [[Engineering:Aerial torpedo|aerial torpedo]]es and the 1940 British aerial attack on the Italian fleet at Taranto, the 1941 Japanese surprise attack on Pearl Harbor was a clear illustration of the [[Social:Power projection|power projection]] capability afforded by a large force of modern carriers. Concentrating six carriers in a single striking unit marked a turning point in naval history, as no other nation had fielded anything comparable.

Meanwhile, the Japanese began their advance through [[Place:Southeast Asia|Southeast Asia]], and the sinking of ''Prince of Wales'' and ''Repulse'' by Japanese land-based aircraft proved in finality that aircraft, and aircraft carrying warships, would dominate the seas.  For the first time in naval history aircraft had sunk a [[Engineering:Battleship|battleship]] while maneuvering at sea and fighting back. In April 1942, the Japanese fast carrier strike force ranged into the Indian Ocean and sank shipping, including the damaged and undefended carrier {{HMS|Hermes|95|6}} (1924). Smaller Allied fleets with inadequate aerial protection were forced to retreat or be destroyed. The Doolittle Raid, consisting of 16 B-25 Mitchell medium bombers launched from {{USS|Hornet|CV-8|6}} against Tokyo, forced the recall of the Japanese strike force to home waters. In the Battle of the Coral Sea, the world's first carrier battle<ref>Francillon p.</ref> and one in which fleets only exchanged blows with aircraft became a tactical victory for the Japanese, but a strategic victory for the allies. For the first time in history, at the Battle of Midway, a naval battle was decisively fought by aircraft and not warships; all four Japanese carriers engaged were sunk by planes from three American carriers (one of which was lost); the battle is considered the turning point of the war in the Pacific. Notably, the battle was orchestrated by the Japanese to draw out American carriers that had proven very elusive and troublesome to the Japanese.

Subsequently, the US was able to build up large numbers of aircraft aboard a mixture of fleet, light and (newly commissioned) escort carriers, primarily with the introduction of the ''Essex''-class in 1943. These ships, around which were built the fast carrier task forces of the 3rd and 5th Fleets, played a major part in winning the Pacific war. The Battle of the Philippine Sea in 1944 was the largest aircraft carrier battle in history and the decisive naval battle of World War II.

The reign of the battleship as the primary component of a fleet finally came to an end when U.S. carrier-borne aircraft sank the largest battleships ever built, the Japanese super battleships {{Ship|Japanese battleship|Musashi||2}} in 1944 and {{Ship|Japanese battleship|Yamato||2}} in 1945. Japan built the largest aircraft carrier of the war: {{Ship|Japanese aircraft carrier|Shinano||2}}, which was a ''Yamato''-class ship converted before being halfway completed in order to counter the disastrous loss of four fleet carriers at Midway. She was sunk by the patrolling US submarine {{USS|Archerfish|SS-311|2}} while in transit shortly after commissioning, but before being fully outfitted or operational, in November 1944.

Wartime emergencies also spurred the creation or conversion of unconventional aircraft carriers. CAM ships, like {{SS|Michael E}}, were cargo-carrying merchant ships that could launch but not retrieve a single fighter aircraft from a catapult. These vessels were an emergency measure during World War II as were the [[Engineering:Merchant aircraft carrier|Merchant aircraft carrier]]s (MACs), such as {{MV|Empire MacAlpine}} which put a flight deck on top of a cargo ship. [[Engineering:Submarine aircraft carrier|Submarine aircraft carrier]]s, such as the French ''Surcouf'' and the Japanese {{sclass-|I-400|submarine|2}}s, which was capable of carrying three Aichi [[Engineering:Aichi M6A|M6A ''Seiran'']] aircraft, were first built in the 1920s but were generally unsuccessful at war.

==Post-war developments==
[[File:DeHavilland Vampire HMS Ocean Dec1945 NAN1 47.jpg|thumb|The first carrier landing and take-off of a jet aircraft: Eric "Winkle" Brown landing on {{HMS|Ocean|R68|6}} in 1945]]

Three major post-war developments came from the need to improve operations of jet-powered aircraft, which had higher weights and landing speeds than their propeller-powered forebears.

The first jet landing on a carrier was made by Lt Cdr Eric "Winkle" Brown who landed on {{HMS|Ocean|R68|6}} in the specially modified [[Engineering:De Havilland Vampire|de Havilland Vampire]] LZ551/G on 3 December 1945.<ref name=BritishNavalAviation>{{cite book | last = Sturtivant | first = Ray | title = British Naval Aviation, The Fleet Air Arm, 1917-1990 | publisher = Arm & Armour Press | year = 1990 | location = London |pages = 161–179| isbn = 0-85368-938-5}}</ref> Brown is also the all-time record holder for the number of carrier landings, at 2,407.<ref name=BritishNavalAviation/>

After these successful tests, there were still many misgivings about the suitability of operating jet aircraft routinely from carriers, and LZ551/G was taken to Farnborough to participate in trials of the experimental "rubber deck". Despite significant effort toward developing this idea, and some performance advantages due to the removal of the undercarriage, it was found to be unnecessary; and following the introduction of angled flight decks, jets were operating from carriers by the mid-1950s.<ref name=BritishNavalAviation/>

===Angled decks===
[[File:Cvnanim.gif|thumb|left| The angled flight deck allows for safe simultaneous launch and recovery of aircraft.]]

During World War II, aircraft would land on the flight deck parallel to the long axis of the ship's [[Engineering:Hull (watercraft)|hull]]. Aircraft which had already landed would be parked on the deck at the bow end of the flight deck. A crash barrier was raised behind them to stop any landing aircraft which overshot the landing area because its landing hook missed the arrestor cables. If this happened, it would often cause serious damage or injury and even, if the crash barrier was not strong enough, destruction of parked aircraft.

An important development of the early 1950s was the introduction by the Royal Navy of the angled flight deck by Capt D.R.F. Campbell RN in conjunction with Lewis Boddington of the Royal Aircraft Establishment at Farnborough.<ref name=BritishNavalAviation/> The runway was canted at an angle of a few degrees from the longitudinal axis of the ship. If an aircraft missed the arrestor cables (referred to as a "bolter"), the pilot only needed to increase [[Engineering:Engine|engine]] power to maximum to get airborne again, and would not hit the parked aircraft because the angled deck pointed out over the sea.

The angled flight deck was first tested on {{HMS|Triumph|R16|6}}, by painting angled deck markings onto the centerline flight deck for touch and go landings.<ref name=SPCflightdeck>{{cite web |url=http://www.navy.gov.au/history/angled-flight-deck |title=The angled flight deck |accessdate=22 January 2013 |work=Sea Power Centre Australia |publisher=Royal Australian Navy}}</ref> This was also tested on {{USS|Midway|CV-41|6}} the same year.<ref name="modification1">Friedman 1983, [https://books.google.com/books?id=-UT7MDTeKj8C&pg=PA188&lpg=PA188&dq=carrier+flight+deck+modification&source=web&ots=HTadZOEwSg&sig=A47Vm-HMxHQuyQIeCR0-2_n1VlY&hl=en&sa=X&oi=book_result&resnum=10&ct=result#PPA264,M1 p.264]</ref><ref>{{cite web|url=http://www.chinfo.navy.mil/navpalib/ships/carriers/histories/cv41-midway/cv41-midway.html |title=U.S. Navy - A Brief History of Aircraft Carriers - USS ''Midway'' (CVB 41) |publisher=Chinfo.navy.mil |date= |accessdate=2009-01-30 |url-status=dead|archiveurl=https://web.archive.org/web/20081228171944/http://www.chinfo.navy.mil/navpalib/ships/carriers/histories/cv41-midway/cv41-midway.html |archivedate=2008-12-28 |df= }}</ref> In both tests, the arresting gear and barriers remained oriented to the original axis deck. During September through December 1952 {{USS|Antietam|CV-36|6}} had a rudimentary sponson installed for true angled deck tests, allowing for full arrested landings, which proved during trials to be superior.<ref name="modification1"/> In 1953 ''Antietam'' trained with both US and British naval units, proving the worth of the angled deck concept.<ref>{{cite web|url=http://www.history.navy.mil/nan/backissues/2000s/2000/ja2000/ppp.pdf|title=Peoples Planes Places|publisher=Naval Historical Center|accessdate=2009-01-30}}</ref> {{HMS|Centaur|R06|6}} was modified with an overhanging angled flight deck in 1954.<ref name=SPCflightdeck/> The US Navy installed the decks as part of the SCB-125 upgrade for the ''Essex''-class and SCB-110/110A for the ''Midway''-class. In February 1955, {{HMS|Ark Royal|R09|6}} became the first carrier to be constructed and launched with the deck, followed in the same year by the lead ships of the British ''Majestic''-class ({{HMAS|Melbourne|R21|6}}) and the American {{sclass-|Forrestal|aircraft carrier|0}} ({{USS|Forrestal|CV-59|6}}).<ref name=SPCflightdeck/>

===Steam catapults===
The modern steam-powered catapult, powered by steam from the ship's [[Engineering:Boiler|boiler]]s or reactors, was invented by Commander C.C. Mitchell of the Royal Naval Reserve.<ref name=BritishNavalAviation/> It was widely adopted following trials on {{HMS|Perseus|R51|6}} between 1950 and 1952 which showed it to be more powerful and reliable than the hydraulic catapults which had been introduced in the 1940s.<ref name=BritishNavalAviation/>

===Optical Landing Systems===
The first of the Optical Landing Systems was another British innovation, the Mirror Landing Aid invented by Lieutenant Commander H. C. N. Goodhart RN.<ref name=BritishNavalAviation/> This was a [[Engineering:Gyroscope|gyroscopically]]-controlled concave mirror (in later designs replaced by a [[Physics:Fresnel lens|Fresnel lens]] Optical Landing System) on the port side of the deck. On either side of the mirror was a line of green "datum" lights. A bright orange "source" light was directed into the mirror creating the "ball" (or "meatball" in later USN parlance), which could be seen by the aviator who was about to land. The position of the ball compared to the datum lights indicated the aircraft's position in relation to the desired glidepath: if the ball was above the datum, the plane was high; below the datum, the plane was low; between the datum, the plane was on glidepath. The gyro stabilisation compensated for much of the movement of the flight deck due to the sea, giving a constant glidepath. The first trials of a mirror landing sight were conducted on HMS ''Illustrious'' in 1952.<ref name=BritishNavalAviation/> Prior to OLSs, pilots relied on visual flag signals from Landing Signal Officers to help maintain proper glidepath.

===Nuclear age===
The US Navy attempted to become a strategic nuclear force in parallel with the {{wipe|United States Air Force}} (USAF) long-range bombers with the project to build {{USS|United States|CVA-58|2}}. This ship would have carried long range twin-engine bombers, each of which could carry an atomic bomb. The project was canceled under pressure from the newly created {{wipe|United States Air Force}}. This only delayed the growth of carriers. [[Engineering:Nuclear weapon|Nuclear weapon]]s would be part of the carrier weapons load, despite Air Force objections, beginning in 1950 aboard {{USS|Franklin D. Roosevelt|CV-42|6}} and continuing in 1955 aboard {{USS|Forrestal|CV-59|6}}. By the end of the 1950s the Navy had a series of nuclear-armed attack aircraft.

The US Navy also built the first aircraft carrier to be powered by [[Physics:Nuclear reactor|nuclear reactor]]s. {{USS|Enterprise|CVN-65|6}} was powered by eight nuclear reactors and was the second surface warship, after {{USS|Long Beach|CGN-9|6}}, with nuclear propulsion. Subsequent nuclear supercarriers starting with {{USS|Nimitz|CVN-68|6}} took advantage of this technology to increase their endurance utilizing only two reactors. While other nations operate nuclear-powered submarines, thus far only France has a nuclear-powered carrier, ''Charles de Gaulle''.

===Helicopters===
[[File:USS Tripoli LPH10 a.jpg|thumb|USS ''Tripoli'', a US Navy {{sclass-|Iwo Jima|amphibious assault ship|0}} helicopter carrier]]

The post-war years also saw the development of the [[Engineering:Helicopter|helicopter]], with a variety of useful roles and mission capability aboard aircraft carriers. Whereas fixed-wing aircraft are suited to air-to-air combat and air-to-surface attack, helicopters are used to transport equipment and personnel and can be used in an anti-submarine warfare (ASW) role, with dipping sonar, air-launched torpedoes, and depth charges; as well as for anti-surface vessel warfare, with air-launched anti-ship missiles.

In the late 1950s and early 1960s, the United Kingdom and the United States converted some older carriers into helicopter carriers or Landing Platform Helicopters (LPH); seagoing helicopter bases like {{HMS|Bulwark|R08|6}}. To mitigate the expensive connotations of the term "aircraft carrier", the new {{sclass-|Invincible|aircraft carrier|0}} carriers were originally designated as "through deck cruisers"{{Citation needed|date=December 2018}} and were initially to operate as helicopter-only escort carriers. The arrival of the Sea Harrier [[Engineering:VTOL|VTOL]]/[[Engineering:STOVL|STOVL]] fast jet meant they could carry fixed-wing aircraft, despite their short flight deck.

The United States used some ''Essex''-class carriers initially as pure anti-submarine warfare (ASW) carriers, embarking helicopters and fixed-wing ASW aircraft like the S-2 Tracker. Later, specialized LPH helicopter carriers for the transport of Marine Corps troops and their helicopter transports were developed. These evolved into the Landing Helicopter Assault (LHA) and later into the Landing Helicopter Dock (LHD) classes of amphibious assault ships, which normally also embark a few Harrier aircraft.

===Ski-jump ramp===
[[File:FRS.1 ski-jump take-off HMS Invincible.JPEG|thumb|The ski-jump on Royal Navy carrier {{HMS|Invincible|R05|6}}]]

Another British innovation was the ski-jump ramp as an alternative to contemporary catapult systems.<ref name=BritishNavalAviation/> The ski-jump ramp at the end of a runway or flight deck allows an aircraft which makes a running start to convert part of its forward momentum into upward motion. The intent is that the additional altitude and upward-angled flight path from the jump provides extra time until the forward airspeed generated by engine thrust is high enough to maintain level flight. [[Engineering:STOVL|STOVL]] aircraft often also use their ability to direct some of their thrust downwards to give them additional lift until required airspeed is attained.

As the Royal Navy retired or sold the last of its World War II-era carriers, they were replaced with smaller ships designed to operate helicopters and the STOVL Sea Harrier jet. The ski-jump gave the Harriers an enhanced STOVL capability, allowing them to take off with heavier payloads.<ref>{{cite web|url=http://oai.dtic.mil/oai/oai?verb=getRecord&metadataPrefix=html&identifier=ADA378145|title=oai.dtic.mil/oai/oai?verb=getRecord&metadataPrefix=html&identifier=ADA378145<!--INSERT TITLE-->}}</ref> It was subsequently adopted by the navies of other nations including India, Spain, Italy, Russia, and Thailand.

==Post-World War II conflicts==

===UN carrier operations in the Korean War===
The United Nations command began carrier operations against the North Korean Army on July 3, 1950 in response to the invasion of {{wipe|South Korea}}. Task Force 77 consisted at that time of the carriers {{USS|Valley Forge|CV-45|6}} and {{HMS|Triumph|R16|6}}. Before the armistice of July 27, 1953, twelve U.S. carriers served 27 tours in the Sea of Japan as part of Task Force 77. During periods of intensive air operations as many as four carriers were on the line at the same time (see Attack on the Sui-ho Dam), but the norm was two on the line with a third "ready" carrier at Yokosuka able to respond to the Sea of Japan at short notice.

A second carrier unit, Task Force 95, served as a blockade force in the Yellow Sea off the west coast of North Korea. The task force consisted of a [[Organization:Commonwealth of Nations|Commonwealth]] light carrier ({{HMS|Triumph|R16|6}}, {{HMS|Theseus|R64|2}}, {{HMS|Glory|R62|2}}, {{HMS|Ocean|R68|2}}, and {{HMAS|Sydney|R17|6}}) and usually a U.S. escort carrier ({{USS|Badoeng Strait|CVE-116|6}}, {{USS|Bairoko|CVE-115|2}}, {{USS|Point Cruz|CVE-119|2}}, {{USS|Rendova|CVE-114|2}}, and {{USS|Sicily|CVE-118|2}}).

Over 301,000 carrier [[Social:Sortie|sortie]]s were flown during the Korean War: 255,545 by the aircraft of Task Force 77; 25,400 by the Commonwealth aircraft of Task Force 95, and 20,375 by the escort carriers of Task Force 95. United States Navy and Marine Corps carrier-based combat losses were 541 aircraft. The Fleet Air Arm lost 86 aircraft in combat, and the Australian Fleet Air Arm 15.

===Post-colonial conflicts===
In the period following World War II through the 1960s, the United Kingdom, France, and the Netherlands employed their carriers during decolonization conflicts of former colonies.

France employed the carriers ''Dixmude'', ''La Fayette'', ''Bois Belleau'', and ''Arromanches'' to conduct operations against the Viet Minh during the 1946–1954 First Indochina War.<ref>{{cite web|url=http://www.hazegray.org/navhist/carriers/france.htm |title=World Aircraft Carriers List: France |publisher=Hazegray.org |date= |accessdate=2009-01-30}}</ref>

The United Kingdom used carrier-based aircraft from {{HMS|Eagle|R05|6}}, {{HMS|Albion|R07|6}}, and {{HMS|Bulwark|R08|6}}, and France from ''Arromanches'' and ''La Fayette'', to attack Egyptian positions during the 1956 Suez Crisis. Royal Navy carriers {{HMS|Ocean|L12|6}} and ''Theseus'' acted as floating bases to ferry troops ashore by helicopter in the first ever large-scale helicopter-borne assault.<ref>{{cite web|url=http://www.acig.org/artman/publish/article_256.shtml |title=Suez Crisis, 1956 |publisher=Acig.org |date= |accessdate=2009-01-30}}</ref>

The Royal Netherlands Navy deployed {{HNLMS|Karel Doorman|R81|6}} and an escorting battle group to  Western New Guinea in 1962 to protect it from Indonesian invasion. This intervention nearly resulted in her being attacked by the {{wipe|Indonesian Air Force}} using Soviet supplied [[Engineering:Tupolev Tu-16|Tupolev Tu-16]]KS-1 Badger naval bombers carrying anti-ship missiles. The attack was called off by a last-minute cease fire.<ref>[http://www.angkasa-online.com/09/12/english/english1.htm Tu-16 Badger: The stealth from the Southern Hemisphere - Rubrik HISTORY<!-- Bot generated title -->] {{webarchive |url=https://web.archive.org/web/20081022071307/http://www.angkasa-online.com/09/12/english/english1.htm |date=October 22, 2008 }}</ref>

Between 1964 and 1967, the Royal Navy deployed the Far East Fleet carriers ''Ark Royal'', ''Centaur'', and {{HMS|Victorious|R38|6}} in support of operations in Borneo during the Konfrontasi conflict between Indonesia and Malaysia. HMS ''Albion'' and ''Bulwark'' were deployed as commando carriers, and the Australian carrier HMAS ''Sydney'' served as a troop transport.<ref>{{cite web |url=http://www.britains-smallwars.com/Borneo/units.html |title=British & Commonwealth units serving in Borneo, Brunei and supporting operations 1962 - 1966 |publisher=Britains-smallwars.com |date= |accessdate=2009-01-30 |archive-url=https://web.archive.org/web/20090125030838/http://www.britains-smallwars.com/Borneo/units.html |archive-date=2009-01-25 |url-status=dead }}</ref>

===Indo-Pakistan War of 1971===
During the war, India deployed {{INS|Vikrant|R11|6}} against Pakistan from its station in the Andaman Islands for operations against Pakistani forces in the East (present day Bangladesh). [[Engineering:Hawker Sea Hawk|Hawker Sea Hawk]]s from the carrier successfully choked the Chittagong harbour and put it out of service.

===U.S. carrier operations in Southeast Asia===
The United States Navy fought "the most protracted, bitter, and costly war"<ref>René Francillon</ref> in the history of naval aviation from August 2, 1964 to August 15, 1973 in the waters of the South China Sea. Operating from two deployment points (Yankee Station and Dixie Station), carrier aircraft supported combat operations in South Vietnam and conducted bombing operations in conjunction with the U.S. Air Force in North Vietnam under Operations Flaming Dart, Rolling Thunder, and Linebacker. The number of carriers on the line varied during differing points of the conflict, but as many as six operated at one time during Operation Linebacker.

Twenty-one aircraft carriers, all of the attack carriers operational during the era except {{USS|John F. Kennedy|CV-67|2}}, deployed to Task Force 77 of the US Seventh Fleet, conducting 86 war cruises and operating 9,178 total days on the line in the Gulf of Tonkin. 530 aircraft were lost in combat and 329 more in operational accidents, causing the deaths of 377 naval aviators, with 64 others reported missing and 179 captured. 205 officers and men of the ship's complements of three carriers {{USS|Forrestal|CV-59|2}}, {{USS|Enterprise|CVN-65|2}}, and {{USS|Oriskany|CV-34|2}}, were killed in major shipboard fires. At times some of the carrier groups operated over 12,000&nbsp;miles from their home ports.

===Falklands War===
[[File:HMS Invincible (R05) Norfolk.jpg|thumb|{{HMS|Invincible|R05|6}}]]

During the Falklands War the United Kingdom was able to win a conflict 8,000&nbsp;miles (13,000&nbsp;km) from home in large part due to the use of the light fleet carrier {{HMS|Hermes|R12|6}} (1959) and the smaller "through deck cruiser" carrier {{HMS|Invincible|R05|6}}. The Falklands showed the value of [[Engineering:STOVL|STOVL]] aircraft, the [[Engineering:Hawker Siddeley Harrier|Hawker Siddeley Harrier]], both the RN Sea Harrier and press-ganged RAF Harrier variants, in defending the fleet and assault force from shore-based aircraft and in attacking the enemy. Sea Harriers shot down 21 fast-attack jets and suffered no aerial combat losses, although six were lost to accidents and ground fire. Helicopters from the carriers were used to deploy troops and for medevac, search and rescue and anti-submarine warfare.

Another lesson from the Falklands War resulted in the withdrawal of Argentina's aircraft carrier ARA ''Veinticinco de Mayo'' with her A-4Qs. The sinking of the Argentine cruiser ARA ''General Belgrano'' by the fast attack submarine HMS ''Conqueror'' showed that capital ships were vulnerable in nuclear submarines' hunting grounds.

===Operations in the Persian Gulf===
The U.S. has also made use of carriers in the Persian Gulf and Afghanistan and to protect its interests in the Pacific. During the 2003 invasion of Iraq U.S. aircraft carriers served as the primary base of American air power. Even without the ability to place significant numbers of aircraft in Middle Eastern airbases, the United States was capable of carrying out significant air attacks from carrier-based squadrons. Recently, U.S. aircraft carriers such as the {{USS|Ronald Reagan|CVN-76|2}} provided air support for counter-insurgency operations in Iraq.

==Key technologies==
{|class="wikitable sortable"  style="font-size: 88%;"
|- 
!Feature !! First seen !! First demonstrated on/at !! First commissioned carrier !! Entry into service !! Notes
|-
|Flight takeoff deck || 1910 || {{USS|Birmingham|CL-2}} || {{HMS|Repulse|1916}} || 1917 || 
|-
|Full length flight deck || 1918 || {{HMS|Argus|I49}} || HMS ''Argus'' (I49)  || 1918  ||
|-
|Angled flight deck || 1948 || {{HMS|Warrior|R31}} || {{USS|Antietam|CV-36}} || 1952 ||
|-
|Aircraft elevators || 1918 || {{HMS|Argus|I49}} || HMS ''Argus'' (I49)  || 1918 ||
|-
|Purpose built carrier || 1918 || {{HMS|Hermes|95}} || IJN Hōshō || 1922 || 
|-
|Arresting gear || 1911 || {{USS|Pennsylvania|ACR-4}} || {{HMS|Argus|I49}} || 1918 || ''Argus'' was fitted with longitudinal gear, by W.A.D.Forbes 
|-
|Transverse arrestor gear || 1922 || {{USS|Langley|CV-1}} || ''Béarn'' || 1927 || 
|-
|Hydraulic Arrestor Gear || 1927 || ''Béarn'' || ''Béarn'' || 1927 ||
|-
|Starboard Island || 1924 || {{HMS|Hermes|95}} || HMS ''Hermes'' (95) || 1924 || 
|-
|Hurricane Bow || 1924 || {{HMS|Hermes|95}} || HMS ''Hermes'' (95) || 1924 || 
|-
|Aircraft catapult || 1915 || {{USS|North Carolina|ACR-12}} || {{USS|Langley|CV 1}} - compressed air<br />  {{USS|Lexington|CV-2}} - flly wheel<br />{{HMS|Courageous|50}} - hydraulic|| 1922<br />1927<br />1934 || LCDR Henry Mustin made the first successful launch on 5 November 1915,
|-
|Steam Catapult || 1950 || {{HMS|Perseus|R51}} || {{HMS|Ark Royal|R09}}<BR /> {{USS|Hancock|CV-19}}<br />{{USS|Shangri-La|CVA-38}} || 1955 || Added to ''Hancock'' and ''Shangri-La'' during their SCB-27C/125 refits.
|-
| Jet Aviation || 1945 || {{HMS|Ocean|R68}} || {{USS|Saipan|CVL-48}} || 1948 ||A [[Engineering:De Havilland Vampire|Sea Vampire]] flown by Eric "Winkle" Brown made the first  ever carrier landing on 4 December 1945
|-
|Optical landing system || 1953 || {{HMS|Illustrious|87}} || {{HMS|Ark Royal|R09}} || 1955 || Invented in 1951 by Nicholas Goodhart
|-
|[[Engineering:Nuclear marine propulsion|Nuclear marine propulsion]] || 1961 || {{USS|Enterprise|CVN-65}} || USS ''Enterprise'' CVN-65 || 1961 ||
|-
|Ski-jump || 1973 || RAE Bedford || {{HMS|Invincible|R05}} || 1977 || 
|-
|[[Engineering:Electromagnetic Aircraft Launch System|EMALS]] || 2010 || [[Organization:Lakehurst Maxfield Field|Lakehurst Maxfield Field]] || {{USS|Gerald R. Ford|CVN-78}} ||  2017 ||
|-
|}

==See also==
* Modern United States Navy carrier air operations
* Project Habakkuk
* Seadrome
* [[Engineering:Mobile offshore base|Mobile offshore base]] (concept)
* Airborne aircraft carrier
* [[Engineering:Floating airport|Floating airport]] (concept)

===Types of ships that carry aircraft===
* ASW carrier
* [[Engineering:Escort carrier|Escort carrier]]
* Helicopter carrier
* Light aircraft carrier
* Supercarrier
* Amphibious assault ship
* Seaplane tender
* [[Engineering:Balloon carrier|Balloon carrier]]
* [[Engineering:Submarine aircraft carrier|Submarine aircraft carrier]]

===Related lists===
* List of aircraft carriers
** List of aircraft carriers by country
** List of aircraft carriers by type
** List of aircraft carrier classes of the United States Navy
** List of aircraft carriers in service
** Timeline for aircraft carrier service
* List of amphibious warfare ships

==References==

===Notes===
{{reflist|2}}

===Bibliography===
* Francillon, René J, ''Tonkin Gulf Yacht Club US Carrier Operations off Vietnam'', (1988) {{ISBN|0-87021-696-1}}
* {{cite book|last=Friedman|first=Norman|title=British Carrier Aviation: The Evolution of the Ships and Their Aircraft|year=1988|publisher=Naval Institute Press|location=Annapolis, Maryland|isbn=0-87021-054-8}}
* Nordeen, Lon, ''Air Warfare in the Missile Age'', (1985) {{ISBN|1-58834-083-X}}
* Ader, Clement, "Military Aviation", 1909, Edited and translated by Lee Kennett, Air University Press, Maxwell Air Force Base Alabama, 2003, {{ISBN|1-58566-118-X}}
* Sheldon-Duplaix, Alexandre, ''Histoire mondiale des porte-avions: des origines à nos jours''. (Boulogne-Billancourt: ETAI, DL, 2006).
* Friedman, Norman, ''U. S. Aircraft Carriers: an Illustrated Design History'', Naval Institute Press, 1983 - {{ISBN|0-87021-739-9}}. Contains many detailed ship plans.
*{{cite book|author=Polak, Christian|year=2005|title=Sabre et Pinceau: Par d'autres Français au Japon. 1872-1960|others=Hiroshi Ueki (植木 浩), Philippe Pons, foreword; 筆と刀・日本の中のもうひとつのフランス (1872-1960)|language=French, Japanese|publisher=éd. L'Harmattan}}
* Williams, Alison J. "Aircraft carriers and the capacity to mobilise US power across the Pacific, 1919–1929,"  ''Journal of Historical Geography'' (2017) 15#1 71-81 [https://www.sciencedirect.com/science/article/pii/S0305748817301664 Online free] doi.org/10.1016/j.jhg.2017.07.008

==External links==

[[Category:Ship types]]

{{Sourceattribution|History of the aircraft carrier|1}}