| Imperial Japanese Navy Air Service | |
|---|---|
| 日本帝國海軍航空隊 Dai-Nippon Teikoku Kaigun Koku Tai | |
 | |
| Active | 1912–1945 |
| Country |  Empire of Japan |
| Branch |  Imperial Japanese Navy |
| Type | Naval aviation |
| Engagements | World War I Second Sino-Japanese War World War II |
| Commanders | |
| Ceremonial chief |  Emperor of Japan |
| Notable commanders | Chuichi Nagumo Minoru Genda Mitsuo Fuchida |
| Insignia | |
| Roundel | .svg) |
The Imperial Japanese Navy Air Service (大日本帝國海軍航空隊, Dai-Nippon Teikoku Kaigun Kōkū-tai) (IJNAS) was the air arm of the Imperial Japanese Navy (IJN). The organization was responsible for the operation of naval aircraft and the conduct of aerial warfare in the Pacific War.
The Japanese military acquired their first aircraft in 1910 and followed the development of air combat during World War I with great interest. They initially procured European aircraft but quickly built their own and launched themselves onto an ambitious aircraft carrier building program. They launched the world's first purpose-built aircraft carrier, Hōshō, in 1922. Afterwards they embarked on a conversion program of several excess battlecruisers and battleships into aircraft carriers. The IJN Air Service had the mission of national air defence, deep strike, naval warfare, and so forth. It retained this mission to the end.
The Japanese pilot training program was very selective and rigorous, producing a high-quality and long-serving pilot corps, who were very successful in the air during the early part of World War II in the Pacific. However, the long duration of the training program, combined with a shortage of gasoline for training, did not allow the IJN to rapidly provide qualified replacements in sufficient numbers. Moreover, Japan, unlike the U.S. or Britain, never altered its program to speed up the training process of its recruits. The resultant decrease in quantity and quality, among other factors, resulted in increasing casualties toward the end of the war.
Japanese navy aviators, like their army counterparts, preferred maneuverable aircraft, leading to lightly built but extraordinarily agile types, most famously the A6M Zero, which achieved its feats by sacrificing armor and self-sealing fuel tanks. Aircraft with armor and self-sealing fuel tanks, such as the Kawanishi N1K-J would not enter service until late 1944–1945, which was too late to have a meaningful impact.