Two planes gratuitously highjacked by bearded guys flew right in the Towers after the passengers elected it was safer to remain idle and die in a horrendous crash than face the perils of trying to neutralize a couple of boxcutter equipped guys. It's also public domain that one of the terrorist was wielding crutches (he had an amputated leg) and another one kept the victims at bay thanks to a horrific Chucky doll. They politely asked the pilots to please hand them the commands and coach them a bit to begin with, while they inquired if the plane was equipped with an automatic or manual transmission. Unfortunately, not a single soul at NORAD noticed the planes changing trajectories on the radar because they were busy changing their Facebook status.