双发延程飞行（英语：Extended-range Twin-engine Operational Performance Standards，航空字母缩写：ETOPS，美国联邦航空总署简略为「Extended Operation」），延程飞行（Extended Operations）与长程飞行（Long Range Operational Performance Standards）标准，前身包括双发动机延程飞行 （Extended-range Twin-engine Operational Performance Standards），或双发动机延程操作标准，最初是国际民航组织为一些运行备降机场之间超过60分钟航程的航线的双发动机商用飞机所定下的规定。 ETOPS容许双发动机飞机如波音737、757、767、777、787、空中巴士A300、A310、A320、A330、A350作长距离飞行（尤其是穿越沙漠、海洋和极地的航线）。ETOPS定立前，双发动机飞机都不能运行这一类航班。

ETOPS is an aviation acronym for Extended Operations. The term used to signify Extended Range Operation with Two-Engine Airplanes but the meaning was changed by the US Federal Aviation Administration (FAA) when regulations were broadened to include aircraft with more than two engines. 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 had been off-limits to twin-engined aircraft, and subsequently to extended range operations of four-engined aircraft (such as the Boeing 747-8 Intercontinental).