Not sure I like that, due to the ack weenies stealing kills.
ex. removing the horizontal stabs/elevators. This almost certainly means the plane is lost, however anyone (or ack if it could) can put more lead in the plane and snake the kill.
So... make it so that when the plane is rendered unflyable, no more damage is counted for kill credit. Then ack weenies can get their kills and yet not snake the kills from a plane that's missing a wing or something.