FlightGear – powerful, realistic, free flight simulator. This is a realistic simulation, and not a game. FlightGear is intended for use in research, teaching and other purposes.
FlightGear flight simulator has a huge number of features, including: a realistic physical model of the flight; customizable controls; realistic weather conditions affecting flight; more than 20,000 modeled airports in the world; the objects on land; joint flights online (multiplayer).
FlightGear allows you to control multiple planes and helicopters. Anyone can create their aircraft.
The game is not fun for aircraft control need to know a lot of keys on the keyboard.
FlightGear is available for Linux, FreeBSD, Windows, and MacOS X.