I remember in the mid-1990s the question of how many minutes away from a diversion airport a two-engine passenger jet should be allowed to fly in the event of an engine failure. Staying in the air long enough is one of those high-availability functions that really matters. In the case of the Boeing 777, it was the first aircraft to enter service with a 180-minute extended operations certification (ETOPS)1. This meant that longer over-water and remote terrain routes were immediately possible.
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