Heavy losses of Japanese carrier based aircraft according to the U.S. Joint Intelligence Committee. Daily summary dated 13 April 1942

An item reported that the plane losses of the Japanese aircraft carriers recently operating at Ceylon (Colombo, Trincomalee etc.) was estimated to be 60%.

Source

Map Room Papers (Roosevelt Administration), 1942 - 1945. U.S. Joint Intelligence Committee. Daily summary No. 124 dated 13 April 1942