Originally Posted by Blackdog_kt

This is probably due to the scripts that despawn aircraft to lessen the strain on the servers. Once you are out of the aircraft (landed and respawing or bailing out) it's turned over to AI control and the script despawns it after an amount of seconds (giving it a chance to crash first so it doesn't disappear mid-air, but not giving it enough time for a well trimmed aircraft with a dead pilot to fly until the the fuel is exhausted, at least that's how it works on Syndicate).

A solution would probably need some rework of the script so that it doesn't allow creating a new aircraft until the previous one is crashed or despawned, keeping the aircraft's "virtual ID" tied to the player who was in the cokpit until the aircraft is removed.