British Airways Flight 476, registration G-AWZT, was a Trident 3B en route from London's Heathrow Airport to Istanbul, Turkey on September 10, 1976. Inex-Adria Aviopromet Flight 550, registration YU-AJR, was a Douglas DC-9 en route from Split, Croatia to Cologne, West Germany. The two aircraft collided in mid-air at 10:14 UTC near the city of Zagreb, Yugoslavia, killing all 176 aboard both aircraft.