ETOPS

ETOPS

!The difference between an ETOPS-enabled shorter flight path (the solid green line) and a flight path for non-ETOPS aeroplane (the dashed blue line), the latter being curved due to the required distance to alternates

History

!Pictured [Lufthansa Boeing 747-8I registration D-ABYT; airliners with more than two engines were preferred on long-haul operations due to restrictions limiting two-engined aircraft to fly through remote areas.](//upload.wikimedia.org/wikipedia/commons/thumb/f/f4/LufthansaBoeing747-8ID-ABYT-31884065307.jpg/250px-LufthansaBoeing747-8ID-ABYT-31884065307.jpg)

History

In 1936, the predecessor to the U.S. Federal Aviation Administration (FAA), the U.S. Bureau of Air Commerce, restricted commercial operations within United States airspace to within 100 miles (160 km) of an adequate airport. For many aircraft of that era this meant about 60 minutes with one engine inoperative.

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