That's kinda the whole point here Gutt....you can't up and stop the pork attacks.
One fast fighter comes screaming in from high. It takes exactly one or two passes at a field to pork it (troops). Even if you manage to get 10 friendlies in the air, the porker is gonna get his two passes before he gets killed in 95% of the cases.
I don't know about you, but I see this as a ridiculously imbalanced defense/setup. 4-5 friendlies in the air, AI and manned gun defenses on the ground and a single enemy fighter can render a base all but useless in one to two passes. It doesn't add up well.