For me there is one spot in particular in Airport, in the same building as the broken elevators, where there is a small (vent?) hole that leads from the second floor and drops into the parking garage. I tried to take a picture of it (print screen, and all of my fnumbers) but all i got was a black screen in paint and couldn't find any .jpgs in the game's folders. I'll keep trying but does anyone else have any other great ideas? The good thing about this spot is if you're equiped with the sniper class, you leave C4 on one of the walls, as someone goes by all you gotta do is blow them up. Worst case scenario you can back up and fall down to the first floor.

Okay got it to work.

http://i50.tinypic.com/1jrnrn.jpg
http://i50.tinypic.com/4qohok.jpg