Dang aliasing! >:(

Well, when you start editing it becomes obvious why it happens. It's a pretty good trick for a sim to make curves out of squares, hee, hee! ;D
Are you "cutting", like for composites, or editing screens, Immelman?
Sometimes changing the camera angle a bit can help to reduce aliasing. Where it can really be a pain is with something with a lot of fine, detailed lines, like a bipe. I imagine that it could be tough with airliner passenger windows is some cases too.
I have AA on my vid card and crank it up as high as it will go but you still can't eliminate everything. Gotta do surgery one way or another, hee, hee! ;)