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I am trying to work out what engine power setting is used during the cruise phase of commercial flights but I can't find anything about it in the usual spots. Anyone have any idea what percent of engine power is used? Like 50% engine power maybe?

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  • $\begingroup$ I retagged your question because I assume that you're asking about typical airliner engine performance. "Commercial" is a very broad term that can include almost any aircraft type and covers a lot more than airline flights. If my assumption was wrong, just change the tags again as needed. $\endgroup$ – Pondlife Jul 31 '16 at 16:26
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At first, I was tempted to close the question as a duplicate, but then I could not find one that would address the point directly. But there are many questions and answers on this site which allow one to cobble together the answer:

To save you to read through all linked answers, here is the gist of it: Jet engines are run at close to their maximum power during cruise, but their thrust is much less at altitude due to lower air density. Airliners want to fly as high as possible to fly faster for the same drag and to gain efficiency, and their designs are balanced to achieve reasonable take-off distances and good cruise performance at close to maximum thrust.

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