Microsoft's free flight game will launch on February 29, 2012 as a direct download from the game's official website. As part of this initial download, you get the Big Island of Hawaii and one playable aircraft: the ICON A5.
If you link the game to your Games for Windows Live account, you'll also have access to a second plane, the Boeing Stearman, as well as supplementary missions, achievements, and an online pilot profile that allows you to track milestones and share your accomplishments with friends.
If you want the entire Hawaiian island chain, well that will cost you. Also available for download on February 29 is the Hawaiian Adventure Pack, an add-on that not only gets you the rest of the Hawaiian islands, but 20 new missions and a new plane: the Vans RV-6A. The Adventure Pack will cost 1600 Microsoft Points, or $20. There are two additional planes available for the game's launch as well, each with a different price point.
Apparently more "detailed" planes -- those offering a cockpit view as well as an external view -- will cost 1200 points ($15) apiece. The first of such planes for Microsoft Flight is the Maule M-7-260C. Planes without the cockpit view, such as the North American P-51 Mustang, will run 640 points ($8). More information about the game can be found on my Microsoft Flight profile page.