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Air traffic over North and South America, 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. Busy airports include Dallas Fort-Worth (centre), Los Angeles LAX airport to the west and Bogota airport in Colombia to the south. The lines connecting the airports represent the flight route taken by airplanes. This image shows the progress of 3,536 flights at one particular moment during the day. Image created by Christian Riekoff using Flighttracker software. (KEYSTONE/SCIENCE PHOTO LIBRARY/CHRISTIAN RIEKOFF)