Everyone already knows that there is a HUGE hole in security where a person with access to baggage or the airplanes can easily sneak someone or something onto the airplane. Hell, a 16 year old boy managed to stow away on an airplane in Virginia and NOBODY saw him. They just found his body along the flight path near the airport in Massachusetts and figured out what he did.
At 9/11 they found boxcutters hidden on planes that were not hijacked, but they were in place. That had to of been done by someone with access to the planes.
Did they also figure he wouldn't do that again? Just curious...