Also via Wikipedia….
The A300 was the first twin-engined widebody airliner in the world. It inspired Boeing twins such as Boeing 767 and 777 and paved the way for ETOPS flights.

And on Wiki itself (Airbus A300 site)
In 1977, the A300B4 became the first “ETOPS compliant” aircraft – its high performance and safety standards qualified it for Extended Twin Engine Operations over water, providing operators with more versatility in routing. Garuda Indonesia became the first airline to fly A300-B4. By 1981, Airbus was growing rapidly, with over 300 aircraft sold and options for 200 more planes for over forty airlines. Alarmed by the success of the A300, Boeing responded with the new Boeing 767.

What wonderful nonsense.

Can you tell Wikipedia is open source? Free to be written by anyone?