9/11 planes didn't get "notified," how would they get notified this time. Tracking was disabled, GPS is one way RECEIVING only. Pakistan is full of deserted mountains and deserts and shit, that's why they thought Bin Laden was hiding there. It's hard to distinguish a plane landing or a plane just flying overhead unless you're near the landing site, or it could have just been flown into a military airbase or something under the ISS or w/e they are.