[link|http://z.iwethey.org/forums/render/content/show?contentid=149598|#149598]. They used knives that were legal to have on the planes.
More screeners wouldn't have helped that part of the problem. The problem was the actions of the hijackers. If pocket knives were forbidden, they would have used scissors. If scissors were forbidden they would have used ...
Before 9/11/2001, if a group of people was determined to do damage to passengers and crew and take over a plane in the US, there was little that could have been done to prevent them with the regulations that were in place. The rules didn't covers such a contingency. They were designed to prevent handguns and explosives from getting on board.
Nice rant though. ;-)
My $0.02.
Cheers,
Scott.