Heroes in the Sky is a free-to-play MMOG. You're a World War II fighter pilot building up your own fleet of fighter planes. All over the globe the Allies and Axis Powers are fighting and you're smack-dab in the middle of it all.
In Heroes in the Sky, you'll fly sorties above historic battlefields from that era: Guadalcanal, Pearl Harbor, Malta and many more. Hone your flying skills and prove your worth. On the PvP battlefields you can set out alone or with your guild to engage in fierce dogfights, to conquer regions, and to show the others what you and your plane are made of.
Source: The Game Website.