How to unlock aircraft in missions

[Soviet Ace]

I've unlocked the FWD-9 and Macchi MC. 202, both in the Single Mission section. To unlock both, just choose the sorties that involve the single word: Fighter. I'm not sure, but isn't the P-47 a DLC? And I haven't unlocked the B-17 yet. Hopefully I'll get it tomorrow? And getting planes of certain difficulties is probably a big thing, I've got a lot of Silver (No golds) and some Bronze here and there. When I get bronze, I don't get much. But when I get Silver, I've unlocked several planes.