The hijacking was led by Le Duc Tan, a ranger in the South Vietnamese army who had recently been demoted from captain to lieutenant following a theft charge involving two cars in Da Nang. How he moved through security checkpoints remains part of the record — he talked his way past them. Once airborne, Tan and two accomplices produced hand grenades and seized control of the aircraft. Their demand was specific: fly to Hanoi, in North Vietnam. The crew faced a situation that had no safe answer. The aircraft was a Boeing 727, not a long-range jet. A direct flight to Hanoi from that point in the conflict-saturated skies of 1974 South Vietnam was not simply a matter of turning north.

The pilot told the hijackers the aircraft needed to land for fuel before any flight north could be attempted. Phan Rang Air Base, a military airfield roughly 100 kilometers south of where the aircraft was operating, was the destination he named. It was a reasonable claim — the 727 had limited range — and it gave the crew a reason to descend and approach a controlled military facility rather than comply with a demand that pointed toward catastrophe. The approach to Phan Rang began. Whether the diversion could have ended differently, whether a negotiation on the ground was possible, belongs to the category of unanswerable questions. The hijackers detonated the grenades as the aircraft was on approach.

The aircraft went down on September 15, 1974, near Phan Rang Air Base. All 75 people aboard died. Among the dead were 67 passengers — people traveling between two Vietnamese cities on a scheduled commercial flight, the kind of journey that implies an ordinary life waiting at the other end — and 8 crew members who had reported for work that morning on a routine assignment. The Chicago Tribune, reporting the following day, noted that two Americans were among those killed. The Aviation Safety Network recorded the aircraft as Boeing 727-121C, registration XV-NJC. The numbers flatten what was a human catastrophe: families who received no one at the arrival gate in Saigon, crew members who had flown this route before and expected to fly it again.

The crash occurred in one of the most turbulent years of the final phase of the Vietnam War. The Paris Peace Accords had been signed in January 1973, but fighting had not stopped. South Vietnam was under severe military and economic pressure, and the social fabric was fraying. Le Duc Tan's demotion and apparent grievances existed inside that larger fracturing — a country under strain, its institutions and individual lives bending under forces that were close to breaking them. The hijacking was not politically motivated in the sense of advancing a cause. It was a desperate act by men with grenades in a country where desperation was becoming commonplace. Seven months later, Phan Rang Air Base itself would fall to North Vietnamese forces. By then, Flight 706 and its 75 dead had been absorbed into a period so crowded with loss that it could barely hold any single tragedy separately.