On December 21, 1988, 250 passengers on Pan Am Flight 103 from London to New York were killed when their plane exploded over Lockerbie, Scotland. Six months before, 290 Iranian passengers in an Iranian Airbus over the Persian Gulf were shot down by an overzealous crew on the USS Vincennes. The program looks into the events that led to the shooting down of the Airbus Flight 165 and reveals a possible link between the shooting down of the Iranian plane and the Lockerbie disaster.