Most planes can easily kill 4 people with ammo to spare. If you “otherwise expended all your ammo”, that’s your problem not mine. If you’ve flown out a plane that has doesn’t have enough ammo for lots of kills, that’s your problem not mine.
Your gameplay decisions are your concern and the consequences of them should not be offloaded onto the other team in the form of a 3-4km deathzone around your airfield to let you repair and re-arm with impunity. Especially so when that deathzone is so easily exploitable for less innocent purposes than “get[ting] back to playing PvP”. The vast, vast majority of people using airfield AA to cover for them haven’t just shot down four planes, they’re just scared of the guy 1km below them on a much lower energy state getting a singular shot off on them.
You are not entitled to a free pass to re-arm just because the other team, as a whole, was able to gain an upper hand and deny you the breathing room to safely land. Doesn’t matter how many you killed, if your team is incapable of fending people off of one single airfield, your team rightly does not deserve the opportunity to safely RTB. It’s a risk, a gamble.
It’s a team game. Your solo actions, while impressive, should not entitle you to freebies like airfield AA covering you while you re-arm and re-climb. There are 16 players on the enemy team, not one. Individual merit counts in how you contribute to the whole, that should be it.