I'm not sure the poster features guys who are likely to be spotted by the average air traveler. I mean, really, is there much chance you're gonna run into Osama bin Laden at the Cleveland airport Chili's?
I can make out that the second guy on the top row is Al Masri, believed to be the leader of al Qaeda in Iraq. I'm guessing the others at the top are similar big names. That would be my only qualm, really, if they're putting up posters of guys who are nowhere near the U.S. and likely never will be. In so doing, are they reinforcing the stereotype of Muslims being terrorists? Maybe, maybe not.
I guess the question is this: Are these posters more likely to (a) help capture a terrorist or (b) lead to extra hassling and possible intimidation for some guy who happens to be Muslim, but just wants to catch a flight to Minneapolis or sell you a newspaper?