Stuka vs. B-17? What?
Don't take the vs. literally.
I just thought some planes belonged together, because they had somewhat similar roles, existed during the same time, and were flown by different countries/factions.
I grouped the Stuka and the B-17 together because they both are bombers. Yes, the B-17 should probably be paired with the He-111, but that plane isn't "generic" enough.
One could also pair the Stuka with the Il-2, but again the Il-2 isn't important enough. You may argue with me here, but I just wanted to keep the number of planes low.