Crossword Genius

The northern polar ____ can make eastbound transatlantic flights two hours shorter than westbound ones (3,6)

Ross

I believe the answer is:

jet stream

(Other definitions for jet stream that I've seen before include "Strong westerlies" , "Upper atmosphere current" , "flow behind aircraft" , "High-altitude, high-speed wind" , "High atmospheric westerly current" .)

I've seen this clue in The Times.
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