[quote=@ASTA]
I mean, at the end of the day, a 75mm flak shell (or dozen flak shells per aircraft kill) costs far less than a heavy bomber or a fighter plane. It's not a question of whether or not spamming planes into Eisenkreis airspace is a possibility, but whether or not such a tactical move is even worth it. 
[/quote]Yup, like I said whether or not AA defenses can shoot down ALL fighters is not the question.
They can take down a ton and that's enough of a deterrent.
I just critiqued the idea that no aircraft could pass their borders.

Anyways, moreso than the bomber (which may be brough down with hundreds or likely even thousands of shots so cost is questionable), it's the life of the human pilots which is the greatest loss in such exchanges.
Granted AA defenses are far from in complete safety but the said bomber is right in the open skies. Its only defense is pretty much that human crews can't aim that well.