For the ultimate in realism, I think that if you die in AH, you should have to wait 17-19 years to fly again. This would raslitically simulate conception, gestation, growth, maturity, basic education, basic training. Then we should be required to spend 6 months in the TA to simulate flight training. FInally, then and only then should we be allowed in MA. By the way, The 17-19 year requirement could be reduced to 13 years if a pilot intends to fly late-war LW like the HE-162.
OK, sarcasm off.

Lazs, I do understand what you are saying, but I think that it is important to be able to close a field quickly. This is necessary due to the sheer size of the maps we play with. If each war were intended to last a long time - i.e., weeks or months - then we could do what you propose. The caveat is that once closed, the base would have to stay closed for a MUCH longer time, hours at a minimum, to make the closure mean anything and have any strategic value.
I also disagree with your comments regarding buff accuracy. I know the LGB's we drop from 25K aren't realistic, but it also isn't realistic to have a single buff overfly a base. To be successful in the market, AH has to be accessible to the individual who doesn't want to fly with a squad or mass formations. Lt Joe Bob needs to be able to do something measurable to impact the flow of a battle to keep interested. So, tradeoffs must be made betwwen gameplay and realism. I don't fault HTC for the deisgn deicsions that they have made- I think they have done a darn good job overall.
Lest this appear to be a total slam on what you have been saying - I do agree with you that there ould be some changes made to acks and/or structures to make the single buff a little less effective. Case in point, large fields - it's really hard to attack and keep them down due to the sheer scope and complexity of the facility. But remember one other thing - in war, cratering the runways is a very common tactic. This alone, in my opiion, should be able to put a field out of action, even if you leave the buildings and acks untouched.
Perhaps what HTC needs to do is institute a "flow control" type logic for damaged fields. If the hangars are down, the number of planes allowed to launch are restricted to a lesser number. Hit the fly button, and you sit in a queue for a couple of minutes until your number comes up.
Just some rambling mid-day thoughts... thanks for listening.

BigBen