Are you putting the aircraft into the distance map, and generating them that way?
Have you considered using sprites?
This is just the first proof of concept. Sprites would be nicer, but their movement would not be as smooth as a 3D map.
And to stay at the reality level, the A4's will be much smaller... (three angry black dots streaking over the sky)
Eventually all types of enemy will be added.
Hpasp Free SAM Simulator, "Realistic to the Switch" (U-2 over Sverdlovsk, B-52's over Hanoi, F-4 Phantoms over the Sinai, F-16's and the F-117A Stealth bomber over the Balkans.) http://sites.google.com/site/samsimulator1972/home
