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Planes flying to the west encounter headwinds that could be as strong as 100 to 150 kts which will slow your ground speed by what ever the winds are blowing. On the trip back, the winds increase your ground speed by that much and on such a long flight, it does make a difference. Increase ground speed by 100 kts for 13 hours comes to 1300 miles and commerical aircraft fly at approx. 550 kts. There's the difference.

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17y ago

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