The 9/11 Commission estimated that the flight was hijacked between 08:51 and 08:54 , shortly after American Airlines Flight 11 struck the World Trade Center and not too long after United Airlines Flight 175 had been hijacked . The last normal radio communications from the aircraft to air traffic control occurred at 08:50:51 . Unlike the other three flights , there were no reports of anyone being stabbed or a bomb threat and the pilots were not immediately killed but shoved to the back of the plane with the rest of the passengers . At 08:54 , the plane began to deviate from its normal , assigned flight path and turned south . Two minutes later at 08:56 , the plane 's transponder was switched off . The hijackers set the flight 's autopilot on a course heading east towards Washington , D.C
American Airlines Flight 11
American Airlines Flight 11
American Airlines Flight 77