Have worn Ray-Bans (grey lens) for years for general purpose knocking around (driving, chilling out with a beer, etc).
However, for flying, the best I have found are Randolphs with brown lenses. They pierce glare and haze like nothing else and you can still see the instruments (often helpful)!! Plus, the straight arms are v comfy under an ANR headset. <img src="cool.gif" border="0"> <img src="cool.gif" border="0">