IJN aircraft carriers Kaga and Akagi had three flight decks like steps originally. IJN might thougt of RN two step-flight decks carrier, so IJN increased one more flight deck. But IJN found that two flight decks were no use. So Kaga reformed the three flight decks into a plain deck on 25 June 1935. Akagi reformed on 31 August 1938. Its reform and modernization took almost three years. It spent much money, I think. Akagi and Kaga increased aircraft number 90 to carry, originally were 60. They also adopted island type bridge.
USN aircraft carriers Lexington and Saratoga had have a plain deck each originally. The photo shows that T4M-1 torpedo aircraft takes off in 1929
 Gunzo, p10-13 No.57
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