FlightGear Flight Simulator version 1.9.1 has been actively marketed over the Internet under several aliases and product names, including but not limited to Virtual Pilot 3D, Flight Pro Sim, Pro Flight Simulator, Earth Flight Sim, Real Flight Simulator and Flight Simulator Plus.[5] Usually, $47 USD is charged for the main program and $67 USD is charged for the full World Scenery Package. Numerous ads and review articles that are very similar in wording can also be found scattered across the Internet posted by "affiliates." A number of Facebook pages for these products have also been posted. Recent copies of FlightGear have been using Flight Simulator X images on their website, greatly lying about the capabilities of the simulator.

Because FlightGear is licensed under the GNU General Public License, this is fully legal; however, the morals of these operations are questionable, as many customers who have purchased these products are very dissatisfied with what they receive and feel they have been scammed.[20] Additionally, an investigation by a number of FlightGear developers has found virtually no difference between the source code made available by the FlightProSim, etc. websites and the official version of FlightGear 1.9.1. In fact, FlightProSim, Pro Flight Simulator, etc. almost never recognize that their products are deriratives of FlightGear Flight Simulator, use images from the FlightGear wiki, and are not involved in any way with the FlightGear project.