The largest loss of life on board a single-aircraft is the 520 fatalities in the 1985 Japan Airlines Flight 123 accident, the largest loss of life in multiple aircraft in a single accident is the 583 fatalities in the two Boeing 747's that collided in the 1977 Tenerife airport disaster, while the largest loss of life overall in a collective incident is the 2,996 fatalities in the coordinated terrorist destruction of airplanes and occupied buildings in the 2001 September 11 attacks.