 At 08: 24: 38, Atta tried to make an announcement to the passengers, but pressed the wrong button and sent the message to Boston ARTCC. Air traffic controllers heard Atta announce, "We have some planes. Just stay quiet and you 'll be O.K. We are returning to the airport." At 08: 24: 56, he announced "Nobody move. Everything will be okay. If you try to make any moves, you'll endanger yourself and the airplane. Just stay quiet." As before, Atta thought he was speaking to only the passengers, but his voice was picked up and recorded by air traffic controllers. After the transmissions by Atta and the inability to contact the airliner, air traffic controllers at Boston ARTCC realized the flight had been hijacked. At 08: 26, the plane turned south. At 08: 32, the Federal Aviation Administration (FAA) Command Center in Herndon, Virginia, notified FAA headquarters.
