something i've noticed...
no matter what plane i download, i can pretty much always compress the textures from 4mb to 1mb using the same format with 16million colours and reflections.
i downloaded the posky 757 yesterday, i finally convinced myself i like the look of it - despite the ugly face. i thought 'damn, that loads slowly', so i just re-saved the textures. now it loads instantly. i've done this on the crj 200 and 6 or so other planes to the same effect.
Chief Captain