This interesting animation shows air traffic over the United States on a given day. It was created using real air traffic data from the Federal Aviation Administration (FAA). The animation covers the period 8PM to 8PM EST of the following day. In the middle of the night, the number of aircraft on the air is about nine hundred. In the middle of the day, the number of aircraft on the air is around five thousand. Most air traffic is concentrated in the Northeastern part of the country and the main traffic hubs can be distinguished by the number of aircraft concentrated around them.