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Air traffic over Europe, computer artwork. This visualisation is based on the flight schedules of over 30 airline companies. The vertical words are names of airports and their international standard abbreviation. The height of the airport name represents the number of departures from that airport. The lines connecting the airports represent the flight route taken by airplanes. This image shows the progress of 4,720 flights at one particular moment during the day. The projection is from a high arctic latitude viewing south. Image created by Christian Riekoff using Flighttracker software. (KEYSTONE/SCIENCE PHOTO LIBRARY/CHRISTIAN RIEKOFF)