I was wondering, what about subs?
Might it be possible for subs to appear in the IL 2 engine or perhaps for BOB?
They might prove interesting targets for planes.
Also, BOB was a lot of dogfight, true, but remember to include several maritime units (convoys, tankers, several warships), as the european theatre also consisted with interdiction strikes against enemy maritime convoys, tanks and railroads/trains.
targets aplenty!