Just wanted to post the findings of a newcomer to COD, regarding AA: I use ATI cards, so don't have the option of Nvidia's SGSSAA (which in my experience seems to offer the absolute best antialiasing, of course at a big performance cost though). I have tried every single combination of in-game AA, AA forced through CCC, and AA forced through RadeonPro, and absolutely NONE of them make much of any difference whatsoever.
I run a triple-screen resolution of 5904x1080 (three 1920's plus bezel compensation) and while the cockpits of the British planes are generally OK, the aliasing on the German cockpits, for some reason, is just horrid. As are other nearby planes when viewed from any cockpit. I don't know why, but that's what I get.
I've also tried injecting SMAA using
SweetFX, and again -- almost no effect. I do, however, use SweetFX for the other effects like sharpen, etc. which really make the color palette more to my liking.
So, bottom line for me is: even though I have 8x in-game AA on, and additional AA being forced from outside the game, still, in the end, aliasing is still sometimes really bad. Seems like the game engine itself just doesn't accommodate AA very well -- especially on ATI cards since we don't have the SGSSAA option.