I just released Bombable 4.3--a FlightGear add-on that adds multiplayer and AI dogfighting, realistic bombing runs, exploding targets that move realistically and fight back, and much more.
It's now working well with FlightGear 2.4.0--and, in fact, working better than ever.
Release announcement here
Description of Bombable and what is does is here
Download Bombable 4.3 here