It is thought that the highjacking of the plane started at 08:14. This was when the pilot and first officer stopped talking with air traffic control at Boston. Two minutes later, the aircraft stopped flying along the route it was supposed to. No more radio replies came from the aircraft and the system in the aircraft used to avoid crashing into other aircraft was also switched off. Flight attendants Ong and Sweeney contacted American Airlines with AT&T airphones during the hijack. They said the hijackers had hurt two of the other attendants and killed an Israeli passenger. During the long four-minute call, Ong told the airline which seats the hijackers were sitting in and said no-one could get into the cockpit.