CLAUS LUNAU / SCIENCE PHOTO LIBRARY CLAUS LUNAU / SCIENCE PHOTO LIBRARY
Airliners following jet streams. Computer illustration showing passenger jets following the paths of the jet streams (arrowed) as the fly around the globe. Jet streams are fast flowing high-altitude narrow air currents that circle the Earth. The location of the jet streams is extremely important for aviation. Flying with them can not only cut the time of the flight, but it also saves fuel.
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