Why wouldn't the air traffic controller tell them they were going down the wrong runway??
Apparently, from what I've heard today, he wouldn't necessarily be able to see the plane from the tower. And I don't think a visual check is required before take off. Not with one person in the tower, probably performing more than one task, none of which would take him/her near a window.
I'm more concerned about the fatigue factor, now that I think about it. If the crew didn't get to their hotel until at least midnight, then they were out again for a 6 AM flight. And the pilot didn't just get the runway wrong, if that's what happened, so did the co-pilot. Are both of them supposed to verify they're on the right runway, or just the pilot, anyone know?
Cause he didn't bother to look? Or couldn't for some reason.