 The first ship converted, , ferried aircraft and supplies to Japanese possessions before the start of the Pacific War in December 1941 and also served as a training ship between transport missions.Once the war began she did much the same for the newly-conquered areas.Her sister ship, did much the same in 1942. , the last of the three to be converted, only ferried aircraft between Japan and the naval base at Truk before she was sunk by an American submarine in December 1943.