Rather than a solution that would create more problems, there is an easier system that can be used:
Get rid of the "destroy 1 hangar to make airfield useless" system, and replace it with "need destruction of airfield"
In other words, use a system like AW uses, where the airfield can be used until about 2/3 of hangars, bunkers, and fuel tanks are destroyed. After that point, the airfield is "destroyed" and stays that way for 30 minutes, until it can be "rebuilt"
Only "destroyed" airfields can be captured, making BUFFS vital to the airfield-capture process.
A lone bomber cannot make an airfield useless to an entire country, and suicide fighter-bombers have virtually no effect. However, the landgrab still runs its course.
Reducing the fields bombers are available at, does nothing but ruin the game for bomber pilots. We tried that in AW, too, and it didn't work out too well.
J_A_B