When fighting in space, select a Bomber. Fly right into the enemy hanger. Shields up or down doesn't matter. Park directly behind the enemy gunship or transport and wait.

Pilots going to the ships will leave you alone UNLESS you get out of your ship.

When the transport takes off, you take off. Once you both leave the hangar bay start bombing. 4 to 5 bombs will take out a transport and everyone on it.

All you have to do is turn around and head for the hanger and repeat. I have gotten up to 50 kills in a normal battle without dying. Of course, the transports hold different number of AI and players. Enemy players will of course, not be that ***, but nothing the marines pack can appreciably damage your occupied bomber if your pilot has the regeneration bonus.