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It should also be mentioned that ETOPS covers not only the plane, but also the airline. For example if replacing the engines, then the work will be done by two different teams as it less likely they will make the same mistake. Consequently we now have aviation headlines like the 747-8i (with 4 engines) getting ETOPS (t stands for twin) http://atwonline.com/manufacturers/boeing-747-8i-gains-330-m...

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FYI according to Wikipedia the "t" longer stands for twin in FFA usage.

"The FAA has decided to use the single term, 'ExTended OPerationS,' or ETOPS, for all affected operations regardless of the number of engines on the airplane."

(my capitalisation)

http://en.wikipedia.org/wiki/ETOPS

And colloquially, "engines turn or passengers swim."

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