The “Tony” was a US War Dept. codename for both the Kawasaki Ki-100 and Kawasaki Ki-61 model planes. Ki-61 was the original model, though on January 19th, of 1945, a US bombing raid destroyed the engine factory in Akashi, Hyōgo. 275 leftover frames were converted to fit the Mitsubishi Ha-112-II radial engine and the Ki-100 was born. By April of 1945, it is unlikely many of the Ki-61 were still in operation. Instead, it was more probable the above-mentioned Tony attacks were from the Ki-100 models assembled less than two months prior, in February.