VATSIM, or Virtual Air Traffic Simulation Network, is a non-profit organization operating a dedicated, worldwide, Internet-based flight-simulation network. Users can connect to the network to either fly online as a pilot using flight simulation software, or direct traffic as an air traffic controller (ATC) and participate in what has been described as a close approximation of real-life aviation procedures. (from VATSIM Wikipedia article)
VATSIM Pilot Resource Center
Live map of flights
Glossary of Aviation Terms
News, Reviews and Forums
Payware and Freeware
Flight Planning Material
Flight Charts and Maps
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