I hardly respect any of you now.
Except SWulfe, I liked his post, because I would enjoy flying bombers more if those things existed.
Seriously, if you have no intentions of attempting to take a base, leave the fighter hangars alone. A tactical strike in AH would involve bomber hangars, vehicle hangars, ammo, and barracks. That removes that base's ability to pork/capture your field. If it's a mission to take the base, level it.
Actually, I like Lazs idea. Fighters should be able to spawn as long as any hangar is available. To add to it, bombers however, are only spawnable if the large hangars are available. Next, 3000lbs necessary for small hangars, 4000lbs necessary for large hangars. Then add in drift and dispersion for bombs (yet add more blast radius). No flight control at all from a gunner position. You want to manuever and shoot back, hire a gunner.