Falcon 4.0: Allied Force is essentially an updated version of the original Falcon 4.0 with many new features, as well as improved stability. It is also developed by a different company.
As with the original Falcon 4.0, you fly the F-16 in either instant action, multiplayer, a tactical engagement or one of two large dynamic campaigns. The simulated version of the plane is F-16C Block 50/52. In the campaign, you can control every aspect of the air war, and some aspects of the ground war. You can choose to make up every sortie yourself if you wish, or simply leave the computer to it, adding your own as you see fit.
The new features include a new campaign set in the Balkans, along with a revised version of the existing Korean campaign, general improvements to realism (flight models, etc.), a more realistic cockpit, better graphics, an improved, more realistic radar, a dynamic campaign engine and an improved graphics engine with volumetric clouds and advanced lighting effects.