The typical speed of Boeing 777-300ER on the way from Warsaw to New York is 916 km/h. On its way back it reaches 1140 km/h. How is it possible?

it flies at higher altitude
jet stream helps
air convection helps
plane is lighter on way back
The location of the jet stream is ex­treme­ly im­por­tant for avi­a­tion. Com­mer­cial use of the jet stream began on 18 November 1952, when Pan Am flew from Tokyo to Honolulu at an altitude of 7,600 metres, cutting the trip time by over one-third.

Answers distribution

it flies at higher altitude
jet stream helps
air convection helps
plane is lighter on way back
answers
flagGreece
4%
76%
9%
4%
21
flagSpain
4%
69%
8%
8%
23
flagLithuania
7%
64%
14%
0%
14
flagRepublic of Ireland
12%
62%
15%
6%
32
flagDenmark
14%
60%
21%
0%
28
flagItaly
12%
58%
21%
4%
41
flagSweden
14%
55%
18%
7%
27
flagBelgium
27%
55%
11%
5%
18
flagCanada
4%
54%
25%
0%
24
flagFrance
18%
54%
18%
4%
22
flagthe United Kingdom
12%
52%
22%
5%
257
flagNorway
17%
52%
17%
4%
23
flagAustria
9%
52%
28%
4%
21
flagthe United States
8%
51%
30%
3%
98
flagthe Netherlands
15%
51%
21%
6%
33
flagPoland
12%
50%
23%
7%
11401
flagGermany
15%
50%
18%
5%
134
flagUnknown
13%
46%
26%
11%
395
flagSwitzerland
25%
41%
25%
0%
12

Gender

men53%
women47%
it flies at higher altitude
11%
13%
jet stream helps
53%
47%
air convection helps
25%
30%
plane is lighter on way back
9%
8%

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The typical speed of Boeing 777-300ER on the way from Warsaw to New York is 916 km/h. On its way back it reaches 1140 km/h. How is it possible?
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Author: Ninjai
Illustration: Adrian Pingstone
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