Hey guys, I just sent my Air back for replacement after noticing the bottom 1/4 of the screen has TINY Horizontal grey/white lines going across it. It's most noticeable with darker colors of course and really is pretty hard to spot, until you see it. Apple support said it was defective, no hassle for the exchange. This is a different problem than the "flickering" issue that is widely know. These lines are persistent from the second you have something on the screen. Once you get past the bottom 1/4 it became perfect. I then went to the apple store, out of the 6 they had on display, 2 of them also had it to a certain degree. Check yours! Definably shouldn't be like that!