Virtual Air Traffic Simulation Network (VATSIM) is a nonprofit organization that operates an online flight-simulation network noted for its active membership and realism. Users are able to fly aircraft as a pilot, or direct traffic as an air traffic controller in what has been described as a close approximation of real-life aviation procedures. Communications between pilots and controllers are carried out using integrated VoIP or in-game text messages. Users are required to use custom software, designated as approved clients, in order to connect to the simulation. More information...
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