Japan received aircraft from Germany according to the U.S. Joint Intelligence Committee. Daily summary dated 21 December 1941

An item referred to the Navy Department which used Russian sources reporting that Germany gave Japan 1,500 aircraft. Part of the pilots was German and part of the Japanese pilots were trained in Germany.

Source

Map Room Papers (Roosevelt Administration), 1942 - 1945. U.S. Joint Intelligence Committee. Daily summary No. 11 dated 21 December 1941.