What Is ETOPS? Definition & Meaning in Aviation
ETOPS (extended-range twin-engine operations) is the approval that lets a two-engine airliner fly routes where the nearest suitable airport can be far away.
In plain language
Each approval allows a maximum diversion time to an alternate airport, for example 180 minutes. The newer ICAO term is EDTO (extended diversion time operations).
Example
Twin-engine wide-bodies flying between Pakistan and Europe or North America plan routes within their approved diversion time.
Why it matters
ETOPS and EDTO are why twin-engine aircraft can fly long over-water or remote routes. They also shape routing, which is why you may see a long-haul flight keep to certain corridors.