... Some Flights Take Less Time To Fly In One Di­rec­tion?

I have just been to Thai­land, and it felt like the trip home was much slower than the trip there. Is that true?

Science Illustrated - - ASK US -

If the pi­lot suc­ceeds in catch­ing one of the so- called jet streams, which mainly move from the west to the east, the plane can have a tail­wind on part of the trip from Scan­di­navia to Bangkok. It only works one way, though. When the plane goes back home, the pi­lot should do his best to stay away from the jet stream in or­der to avoid a di­rect head­wind.

A pas­sen­ger plane typ­i­cally trav­els at a speed of 900 km/h rel­a­tive to the sur­round­ing air. At an al­ti­tude of 10 km, where pas­sen­ger planes mainly travel, the wind speed can reach an aver­age of 150 km/h and some­times more than 300 km/h. The tail­wind gives the plane a fair push from behind so that – in re­la­tion to the ground sur­face – it sud­denly flies at a speed of 1,000 km/h or more.

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