ETOPS-180 to 180 minutes, etc.

Similar limits have since been applied to three- and four-engine airliners. In some cases, "ETOPS" is still used to refer to these rules, but other terminology has been introduced to remove "twin" from the acronym. ICAO introduced the term "Extended Diversion Time Operations" (EDTO) in 2017.. The European Union Aviation Safety Agency previously used the term "Long Range Operations" (LROPS) for restrictions on airliners with three or four