ETOPS is an aviation acronym for Extended Operation, according to the AC 120-42B. It refers to the standards and recommended practices (SARPS) issued by ICAO for aircraft (such as the Airbus A300, A310, A320, A330 and A350, the Boeing 737, 757, 767, 777, 787, the Embraer E-Jets, and the ATR 72) to fly long-distance routes that were previously off-limits to twin-engined aircraft. (Aircraft produced after February 2015, ETOPS regulations extended for three, and four engines aircraft. The first time to the Boeing 747-8 Intercontinental quad-jet for examples built after that date.).