With its audacious 14 GB hard disk requirement, you can visit 24,000 of the world's airports in all 7 continents. A lot of airplanes are also available in this flight simulator including the ultralite type plane (similar to a glider but has an engine). My favorite airplane that I keep on using during a free flight are the Boeing planes (747-400 and 737-800) because they are easier to control than the Airbus planes. Other than free flight, there are also missions of different levels like landing a turbo jet to Princess Juliana Airport (St. Martin, an island in the Caribbean) which is quite difficult in reality.
I can't believe I'm living the dream. I'm diggin’ the scene. I finally made it through the fire. LOL (exerpt from living the dream by a1).
St. Martin Airport - Princess Juliana Airport