Business Week -- When the long-delayed Boeing 787 Dreamliner finally takes wing above Washington State in its first test flight later this month, much will be riding on its sleek, carbon-fiber back. Some 56 buyers, ranging from Etihad Airways in the United Arab Emirates to Northwest Airlines, have ordered 866 of the planes—enough to keep Boeing busy for more than a decade. This state-of-the-art plane, slated to make its first commercial flights with Japan's All Nippon Airways early next year, will set the Chicago-based manufacturer apart from Airbus and other rivals for years to come.