The advent of flight simulators in the world of video games has inspired many people to become "designers of airplanes" for these systems. So often, there are enthusiasts who plan military or civilian models that do not derive any profit from their creations. Many other users of flight simulators to create their own virtual airline as Virtual Delta Pro Flight Simulator, Mexicana Virtual, Virtual Aeroflot, Virtual Viasa, there are also many other Italian, including the virtual counterpart virtuAlitalia Alitalia and others like Flying Italian, Mediterranean Virtual, Virtual Airlines, Virtual Air Dolomiti, Aerosarda, Brixia Air, Free Flight Airlines, which can be found on the Internet.
These changes (called "mods") increase the quality of the simulation and often provide a gaming experience by adding significant new situations and content. In some cases it is a simulator developed by fans far more than the developers had planned. Falcon 4.0 is an obvious example, have added new war zones and the ability to fly hundreds of different models of aircraft, as opposed to the single original model used.
In addition to "fly", some players enjoy managing air traffic online. This happens when many virtual pilots and virtual air traffic controllers play together in real time and simulate a real air traffic. There are many networks, the most popular are VATSIM and IVAO.