Air Vietnam Flight 706 was a Boeing 727 that crashed on September 15, 1974, near Phan Rang Air Base in South Vietnam. Hijack Le Duc Tan, a ranger in the South Vietnamese army who had recently been demoted from captain to lieutenant for the theft of two cars in Da Nang, smooth-talked his way past security checkpoints. After taking off from Da Nang International Airport (DAD/VVDN) in South Vietnam on a regularly scheduled flight to Saigon's Tan Son Nhat International Airport (SGN/VVTS), the flight was hijacked by Tan, holding two grenades. He demanded to be flown to Hanoi in North Vietnam. For unknown reasons the pilots approached the airfield at Phan Rang Air Base but aborted the landing. Crash The aircraft overshot the base leg and initiated a left turn, during which it lost control. Shortly after that, it plunged to the ground from an altitude of , killing all 75 people aboard. Cause Even though the exact cause remains unclear, it has been speculated that the hijacker caused the crash by setting off his grenades after the pilots refused to give in to his demands. See also Aviation safety List of accidents and incidents involving commercial aircraft References External links Airliner accidents and incidents caused by hijacking Aviation accidents and incidents in 1974 Aviation accidents and incidents in Vietnam Accidents and incidents involving the Boeing 727 Air Vietnam accidents and incidents 1974 crimes in Vietnam Terrorist incidents in Asia in 1974 Mass murder in 1974 Terrorist incidents in Vietnam September 1974 events in Asia 1970s murders in Vietnam 1974 murders in Asia