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 ```Why is it when I travel by air from Chicago to Rome the trip takes slightly more than nine hours, but when I return flying from Rome to Chicago the trip takes almost eleven hours?```
 ```Hi there, For Chicago to Heathrow: "I checked the departure and arrival times of a Boeing 777, which has an advertised cruise speed of 560 mph (900 km/h). After figuring the time elapsed of each trip, I found that the average speed of the trip from Chicago to Heathrow is about 525 mph (845 km/h), while the average speed of the return trip is only about 440 mph (710 km/h)! Notice that not only are both trips considerably slower than the published cruise speed, but the return trip average speed is over 80 mph slower than the original flight! " http://www.aerospaceweb.org/question/dynamics/q0057.shtml The article goes into much more detail, but declares the main reason to be wind. It links to a similar question and answer, which dispels the idea of the Earth's rotation making any difference: "Now stop running. If you were to jump straight up in the air, would the Earth rotate beneath you? (Those who do believe that the Earth rotates around them may want to stop reading right now.) No, because when you left the Earth's surface, you were traveling at the same speed as the surface, so, in essence, the Earth matched your speed through space while you were in the air! The same condition holds true for an airplane as it travels from Los Angeles to Bombay. If we were to ignore the winds, no matter which direction you flew from Los Angeles, the speed of the aircraft relative to the Earth would be the same. While the aircraft?s speed through space would change, the effect of the Earth?s rotation remains constant, and in effect is "cancelled out" no matter which direction you travel. In other words, the speed of the rotation of the Earth is already imparted to the aircraft, and the Earth matches that speed during the entire flight. (Of course, in the case of spacecraft, these speeds become very important.) " http://www.aerospaceweb.org/question/dynamics/q0027.shtml Search keywords: longer london "new york" fly tailwind Best wishes, robertskelton-ga```