VATSIM (short for the Virtual Air Traffic Simulation Network) is a completely free online platform which allows virtual pilots, wherever they are in the world, to connect their flight simulators into one shared virtual world. VATSIM also simulates air traffic control in this virtual world, creating the ultimate as-real-as-it-gets experience for you, the virtual aviation enthusiast.
With over 76,000 active members in 2014, connecting your flight simulator to VATSIM allows you to join hundreds of other pilots in our virtual skies, flying all kinds of aircraft all over the world. As a VATSIM member, you can join our many communities across the world to enhance your flying skills and flight simulator experience in a shared virtual airspace. You can also become a virtual air traffic controller, adding that extra bit of realism for you and your fellow enthusiasts. The real beauty of VATSIM is that it caters people who are completely new to the hobby as well as to the seasoned flight simmer.