I'll continue to shoot until the plane goes "poof" or catastrophic damage occurs, as to ward off the kill thieves.
As for chutes, damn right I'll shoot them. If there is a good fight going, I'm gonna eliminate the chute from popping 6's to his buddies. Usually I'm the type to laugh when someone bails above 6k, because you're out of a plane, for that much longer (5 mins +).