I've never had bombers bail on me ever.
Lucky, lucky you

There are basically two types of bailers:
The first is the classic bomb'n'bailer, who's doing it to decrease turn around time and thus increasing his efficiency in the 'war game'. He's not interested in score, and for the most part he doesn't care if anyone gets a kill from his bail or not.
And there's about nothing that can be done about it, as all 'solutions' that came up over the years are either easily circumvented or have negative side effects on gameplay that outweigh any possible gains from it. (perk loss, no bail from undamaged planes, no reupping for X minutes, bomb damage removed if bailing withing Y seconds...)
The second one is mainly griefing. He doesn't care much about his score, he just does not want to 'give' you a kill, for whatever reasons. He's frequently flying at excessive altitudes and bailing if some interceptor is actually taking the time and closing in on him, often just after getting ion icon range so he can assess the threat you are posing to him.
This is usually the one frustrating other players the most, especially if the fighter pilot had to invest a lot of time and effort to track the enemy and hunt him down.
There's not much that can generally be done about this type either, but I think that increasing proxy range to icon range limit might cut it down a bit. At least, I see no harm from it, or does anyone else do?