Amazing, the number of aircraft in the air at any given time. Each little bright blip is an airplane. Notice the dark area that moves from right to left, nighttime, and how the air traffic changes directions as day changes to night and vice versa.
http://www.youtube.com/watch?v=z1US_4uf4YE
http://www.youtube.com/watch?v=z1US_4uf4YE
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