ETOPS

Acronym of Extended-range Twin-engine Operational Performance Standards or Extended Twin Operational Performance Standards, An aviation rule about how far two-engined aircraft can operate distant from a diversion airport at all times in case of a single-engine failure. Without ETOPS that is 60-minutes of flight time, Various ETOPS levels of qualification extend this to 90, 120, 180-minutes.

Acronym of engines turn or passengers swim, a facetious backronym reinterpretation of ETOPS to explain the literal situation of ETOPS operations, due to the lack of range from single-engine operations on twin-engined aircraft, and circumstances over long-haul ocean routes.