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ETOPS () is an acronym used in aviation for Extended Operations.
The International Civil Aviation Organization (ICAO) coined the acronym for Extended Twin Operations for twin-engine aircraft operation further than one hour from a diversion airport at the one-engine inoperative cruise speed, over water or remote lands, on routes previously restricted to three- and four-engine aircraft.
The ICAO issues Standards and Recommended Practices (SARPS) for ETOPS, and ETOPS were extended to four-engine aircraft like the Boeing 747-8 and the terminology updated to EDTO – Extended Diversion Time Operations.

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