And--propaganda aside--there's really no reason they shouldn't still. A hijacker with even a 4" knife isn't going to do much to a planeload of people who know what he's up to. The terrorists' real weapon on 9-11 was the years of liberal conditioning the passengers and crew had received to just give the hijackers what they wanted without any resistance. Fortunately, that weapon has been completely and utterly destroyed, hopefully forever.
You betchum. I've been on several flights recently, and every red-blooded guy is ready to pounce.