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This question already has an answer here:

Compare

http://www.wolframalpha.com/input/?i=Alaska+Airlines+764+yesterday+duration

and

http://www.wolframalpha.com/input/?i=Alaska+Airlines+771+yesterday+duration

Why the east-bound flight is about 20% faster than the west-bound reverse flight?

Is it because of the average airflow is east-bound?

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marked as duplicate by aeroalias, Federico, Peter Kämpf, Pondlife, RedGrittyBrick Dec 13 '15 at 19:05

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