What's so difficult to believe? We already have planes ignoring all kinds of dangers and buffs flying at 2k alt.
Heck, if we're talking about realism, the ground pounders should drop load on target, and rtb anyway, instead of hang around field, knock ground defenses one by one, and then vulch it to hell.
I mean, what kind of field totes slow firing , 60rpm AA guns anyway? Besides, wouldn't there be always defense personnel who'd take up positions of dead AA gunners and start firing again? Or, set up new guns at different positions as the field is raided?
...
Isn't deacking fields easy enough already?