, the 757 has been involved in 39 aviation occurrences, including 11 hull-loss accidents. Nine incidents and 12 hijackings have resulted in a total of occupant fatalities. The first fatal event involving the aircraft occurred on October 2, 1990, when a hijacked Xiamen Airlines 737 collided with a China Southern Airlines 757 on the runways of Guangzhou Baiyun International Airport, China, killing 46 of the 122 people on board. Two 757-200s were hijacked on September 11, 2001 during a coordinated terrorist attack in the United States; hijackers crashed American Airlines Flight 77 into the Pentagon in Arlington, Virginia, killing all 64 on board and 125 on the ground, and United Airlines Flight 93 was also hijacked, and crashed near Shanksville, Pennsylvania, killing all 44 on board.