Well, US dive bomber comes at level 53 and the first US CV comes at level 50, so I suppose you want to start training your pilots before your BO? :)
More seriously, with torp bombers first selectable at level 42 you would theoretically need to start training them when your BO is about level 42 (The cumulative XP difference between level 50 and 42 is 363980 points, which is coincidentally equivalent with the 376370 XP points needed to get to level 42)
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