A300 is 50

[Asturias56]

Actually I think they sold a load before ETOPS came in Airbus A300 twinjets, the first twin-engine wide-body aircraft, had been flying across the North Atlantic, the Bay of Bengal, and the Indian Ocean under a 90-minute ICAO rule since 1976.

I think ETOPS only came in formally when Boeing offered the 767 in about 1984