Those planes that aren't ground attack specialists and have MG's would be on CAP in your area of operations. When your troops are under air attack by a nasty Shturmovik, your Focke-Wulf would intercept the attacker if it saw the Shturmovik by himself (exp throw) or if he is in radio contact so he can be called to help. And if your Focke-Wulf saw enemy transports (exp throw again) he could try to shoot them down.
I know, this is probably too big a thing to add to the game at this stage of evelopment,
but we can always dream

