IL-2 Sturmovik: Forgotten Battles - Ace Expansion Pack is the expansion pack to the ultra realistic World War II flight simulator IL-2 Sturmovik: Forgotten Battles.
It adds 20 new aircraft, such as the American P-51 and new German Messerschmitt planes. There are also three new environments to fly, in a new campaign which covers 30 intense missions through the Ardennes, Normandy and the Pacific. The game features 10 new co-op multiplayer missions for head-to-head dogfights.
Other additions include several non-flyable aircraft, ground/air units and many other map objects to increase the realism.