Killshooter in general is the ideal(And only grief-free) method for friendly fire in any online game.
The implementation in AH leaves something to be desired though. No matter where you hit a friendly, that shot is applied to one point on your plane(the tail i believe, which oddly enough is the weakest part of most fighters) When you hit a friendly, the damage should be mapped to the same(or a random similar) component. Hit the left wing, your plane gets hit in the left wing, hit the second engine on a friend, but your plane only has one engine, you get hit in the engine.
The effective lethality of killshooter is way too high.