I find bombers to be pretty much free kills if I find myself at co-alt or above them.
And I'm really not very good.
I have a K/D of well above 1.0 in most bombers in AH, most above 2.0 even.
And that's ONLY because the majority of players invariably attacks from 6 o clock. They spend 10 minutes or more to climb up to me, and then can't spend another 5 minutes for a proper setup.
Once I see someone passing by and climbing above me outside my gun range, I know I'm screwed. And 8 out of 10 times I actually am.