Excuse me, but I consider very improbable that a main gun of a WWII tank, can track, aim and hit a flying plane, moving at, let's say, even as low as 200 Km/h. They had neither tracking capacity (slow moving turret, small elevation angle of the gun), nor aiming devices (sights) to predict a succesful shot, nor suitable ammo (too big caliber with no proximity fuzes) to get a hit
So the probability of a hit in RL was really very very small, close to zero.
Of course, some tank crews might have shot their main guns to planes to boost their morale, but this would be the only effect they could get. IMHO, hits shouldn't be as common as in IL-2 are. Perhaps 1 in millions , but I think it wouldn't justify to include this as a normal behaviour of the AI tanks in this Sim
. Specially if there are other enemy ground units nearby which are shooting to your tank !
Pilots may got hit by heavy AA guns, or medium AA guns (37-40 mm) ,and light AA (20-25 mm) indeed.
I have to say that I consider a privilege to be answered by the own famous Mr SaQSon,
, glad to meet you, Sir