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In page Virtual Air Traffic Simulation Network:

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The VATSIM network is open 24 hours a day and network downtime is extremely rare; pilots and controllers are free to connect and fly or control anywhere in the world at any time (subject to qualification restrictions in the case of controllers). However, the network and different ATC centers sponsor regular events to encourage pilots and ATC to congregate at various locations in the world, usually several times a week. At the most popular of these events, traffic levels may be comparable to those of the same locations in real life.[1]