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Also, up until relatively recently regulators wouldn't let twin engines fly transoceanic flights because they deemed it too risky. They added ETOPS[1] regulatio

Also, up until relatively recently regulators wouldn't let twin engines fly transoceanic flights because they deemed it too risky. They added ETOPS[1] regulation in order to allow this [1] https://en.wikipedia.org/wiki/ETOPS https://en.wikipedia.org/wiki/ETOPS

lathiat 9y ago
This is important, ETOPS regulation changes are a big reason twin jets are resurging
dmfdmf 9y ago
Prior to this change you needed 3 or more engines to cross large bodies of water or ice. When ETOPS was revised the abbreviation was backronynmed to "Engines Turn Or Passengers Swim".