Transonic truss-braced wing project is on hold after Boeing proposes to investigate a simpler, thin-wing design.

Boeing and NASA are to pause development of the X-66 flight demonstrator to focus their research on the evolution of long, ...

The X-66 program heavily modified a McDonnell Douglas MD-90 aircraft to demonstrate a truss-braced version of the thin wing. The experimental aircraft was at the forefront of NASA ...

Based on a heavily modified McDonnell Douglas MD-90, the X-66 was intended to demonstrate a truss-braced version of the thin wing at full scale. The experimental aircraft formed the flagship of NASA’s ...

X-15 flights were short; each lasted about ten minutes. So that the rocketplane could use all its fuel for acceleration, it was carried beneath the wing of a NASA B-52 to 45,000 feet, where it was ...