when a player (and yes I do mean fighters and GVs too) is killed, bails or ditches, there is a delay until they can up again. the length of the delay is the time it would take them to get to the nearest friendly base (or spawn for GVs). speed could be based on the aircraft, or perhaps just fixed. takes away the time incentive for BnBing. I would also extend the proxy range to whatever vis range is set for that arena, removes the kill-denying incentive.
If you punish players for getting killed (as opposed to bailing from a viable airplane) you'll just encourage that much more dweebish play in order to avoid the penalty. People will climb to 30,000 feet or run whenever they don't have every advantage because it's better than sitting in the corner for 20 minutes.