At 08:23:38, Atta tried to talk to the passengers from the cockpit but he pressed the wrong button and sent the message to air traffic control. He said that "[They] have some planes, just stay quiet and you'll be okay. We are returning to the airport." A minute later he said, "Nobody move. Everything will be okay. If you try to make any moves, you'll endanger yourself and the airplane. Just stay quiet." Air traffic control realized the aircraft had been hijacked and they called the Federal Aviation Administration. Soon after, Atta announced "Nobody move please, we are going back to the airport, don't try to make any stupid moves." Five minutes later Boston air traffic control called North American Aerospace Defense Command (NORAD). NORAD ordered two F-15 fighter aircraft to catch the flight, but it was too late—AA 11 had already made its last turn towards Manhattan and crashed into the North Tower of the World Trade Center more than six minutes before the fighter aircraft had taken off.