After reading this thread I am almost hesitant to get a 670 if there is a problem with AA on some FSX textures, although I dont fly to many default FSX airports, I dont want to have issues with 3rd party fields ground texture lines. I wish the pics were still visible so I could see exactly how it looks.

Don't hesitate on getting a GTX 670, it's got absolutely nothing to do with this specific model. If any 670 users are thinking about upgrading to a 680 just to get this problem fixed, are gonna be bitterly disappointed. But, it might be NVIDIA related though. But the main cause of the jagged lines is because these lines use no mipmaps and therefore it cannot be properly detected by the GPU as something that should be anti-aliased. Still, that doesn't mean that anti-aliasing doesn't work at all. It is actually being applied to the runway lines, but just not enough, so it will look a bit jagged. For the rest, there are no problems whatsoever with this card so don't hesitate on getting it. 

 

Again, it's not GTX 670 related, because I had it with my GTX 580 and 560Ti as well. The main reason why it's mostly GTX 670 users that are reporting the problem here is because of the title of this tread. "GTX 670 and jaggies."  People who don't own this card or are not interested in it don't really enter this topic as much. 

Don't let this stop you from this card. I have love it, but I also play Assassins Creed 3, Far Cry, Crysis, and other highend GPU dependent games, and this card eats them up. It is a monster, and the lines I am having now are pretty much squared away. Maybe it is Nvidia like stated above, and I am more leaning to this side, as I havn't had this issue before, maybe a new set of drivers, who knows, but this card is awesome.

Thanks Arjen and William.