The Aerion SBJ's projected excellent sonic and subsonic efficiencies are credited to its natural laminar fl ow unswept wing. Power will be provided by a pair of Pratt & Whitney JT8D-219 engines derated to 19,600 pounds of thrust. The Aerion with a 90,000-pound maximum takeoff weight is projected to have a range of more than 4,000 miles, while cruising at either supersonic cruise speeds of 1.5 Mach or subsonic speeds of .95 Mach. According to Brian Barents, Aerion vice chairman, "The major questions about the technical feasibility ... have been answered and we are now able to present to potential partners a design that is well researched and quite achievable." From launch to certifi cation it is predicted to take fi ve years, but the official go-ahead is not expected until Aerion has successfully signed up risk sharing partners. Aerion's goal has been to keep the price of the SBJ under $80 million.