To be 'effective' a plane would have to achieve its goals. I guess the 'effect' that was trying to be obtained was winning the war.
So the 2 possible answeres would be the Il2 and any soviet aircraft.
This doesn't have anything to do with the abilities of the individual aircraft, just realizing their goal!
[Then throught the use of pure logic Skoshi then went on to prove 1 = 2, black is equal to white and that god did not exist. At which point the universe ...................]
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