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It won't work.
Imagine that you spawn on the runway, start your engine and then I vulch your wing off. Should I get a kill for this? You are not wounded, sitting on your own runway in a busted plane, ready to end the "flight", yet your death (or my kill) has already been awarded to me....? Now THAT would really suck!
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If a feild is at the point where if you up, you will be vulched, then why up? What good will upping 1 plane against 10+ enemy's fighters do? They have the E Advantage, Alt advantage, and every other advantage there is. Sure, if you kill the goon, you will save the field....for another 3 mins at least...
BotaBing's idea is a good idea