AF should not make any difference in the cockpit art. AF only becomes noticeable when the angle of the texture is greater than 45 degrees from the viewer's perspective and is also in the distance. Up to that point, trilinear filtering is used anyways, even when forcing AF.
Basically, the outside wing tip (last 1/4 of it or so) surfaces, as viewed from the cockpit would appear better when using AF.
AF does cost frame rates. Nothing is free.
If you are running 1600x1200, and using AA, with max texture settings at 512 or 1024, then you are swapping in video ram. Not good.
If you want to run AA with high textures, and have 256MB of video ram, you need to run at 1280x1024, max texture size at 512, and 2X,..maybe 4X AA, with AF off.