The 1976 Zagreb mid-air collision occurred on 10 September 1976 over the town of Vrbovec near Zagreb in Yugoslavia (now Croatia) at 11:15am local time (10:15 UTC). The aircraft involved were British Airways Flight 476, a Hawker Siddeley Trident 3B en route from London Heathrow Airport to Yeşilköy International Airport, Istanbul, and Inex-Adria Aviopromet Flight 550, a Douglas DC-9-32 en route from Split Kaštela/Resnik Airport, Yugoslavia, to Cologne Bonn Airport, West Germany.