1st Air Fleet

1st Air Fleet (IJNAS)
第一航空艦隊 (Daiichi Kōkū Kantai)
Rising Sun Flag
Active	10 April 1941 – 14 July 1942 1 June 1943 – 15 June 1945
Country	Empire of Japan
Allegiance	Emperor of Japan
Branch	Imperial Japanese Navy
Type	Naval Air Fleet (Kantai)
Engagements	Pacific Theater of World War II Pearl Harbor Wake Island Rabaul Darwin Indian Ocean Coral Sea Midway Eastern Solomons Santa Cruz Philippine Sea Leyte Gulf
Insignia
Roundel

The 1st Air Fleet (第一航空艦隊, Daiichi Kōkū Kantai), also known as the Kidō Butai ("Mobile Force"), was a name used for a combined carrier battle group comprising most of the aircraft carriers and carrier air groups of the Imperial Japanese Navy (IJN) during the first eight months of the Pacific War.

At the time of its best-known operation, the attack on Pearl Harbor, in December 1941, the 1st Air Fleet was the world's largest fleet of aircraft carriers.

In its second generation, 1st Air Fleet was a land-based fleet of "kichi kōkūtai" (base air unit(s)).