Shareware: You can try this program, but this version has some limited features or time usage restrictions. You should purchase it in order to remove those limits.
Vertigo Flight Simulator
Pro Flight Simulator 1
One of the most realistic simulator currently available
Realistic Flight Simulator is the Most Realistic Airplane Flight Simulator Games. Real-Life Flying with Accurate WorldWide Scenery Based On Actual Terrain With Over 20,000 of the World's Real Airports & 120+ Different Planes.