The 22nd Air Flotilla included the 22nd (Genzan), Bihoro, and Kanoya Air Groups (or Kōkūtai). They were equipped with 33 Type 96 Mitsubishi G3M1 "Nell" bombers. The Air Flotilla also had 25 Type 96 Mitsubishi A5M4 "Claude" fighters available. The Genzen Air Group was a key participant in the sinking of the British capital ships and off the coast of Malaya on 10 December 1941, losing one aircraft and its crew during the battle. On 22 January 1942, bombers from the Genzan Air Group attacked Kallang Airport in Singapore, and subsequently provided air support for Japanese offensives in Malaya including the landings at Endau.