How can a plane depart 45 min late, but arrive only 10 min late?

Question

How can a plane depart 45 min late, but arrive only 10 min late?

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Answer 1

How fast a plane flies is relative to the speed of air around it. A plane flying in the same direction as a 50 mph gusts will travel 50 mph faster. Additionally, plane operators and schedulers make their time estimates including air traffic and the most fuel efficient route. If you run into less air traffic and burn more fuel you can arrive sooner.