Just one a month, to take off from a base off the map, to be awarded to the best fighter pilot of the previous tour.
One plane, full complement of weapons, two refuels and reloads, and that's it.
It'll be like the Ferrari Enzo. A pilot, if chosen, will have the option of buying this plane for all his perks. If not, the option gets passed down to the next guy in line. If he lands the plane, he gets his perks back. If not, well, whoever gets the kill is a rich man.
I think it would be great, and would have no drawbacks whatsoever.