High Quality Content by WIKIPEDIA articles! American Airlines Flight 77 was a passenger flight which was hijacked by five al-Qaeda terrorists on September 11, 2001, as part of the September 11 attacks. They deliberately crashed it into the Pentagon near Washington, D.C., killing all 59 people on board plus the hijackers, as well as 125 people in the building. The aircraft involved, a Boeing 757-223, was flying American Airlines` daily scheduled morning transcontinental service from Washington Dulles International Airport, in Dulles, Virginia to Los Angeles International Airport in Los Angeles, California.