Dawn of the Transonic Truss-Braced Wing
Boeing is making ready to modify an MD-90 narrow-body airliner—transforming the machine radically for purpose of testing the company’s Transonic Truss-Braced Wing (TTBW) architecture under the auspices of NASA's Sustainable Flight Demonstrator project. Upon completion of an extensive series of structural modifications, the MD-90 will emerge as the X-66A.