Learn more about Boeing's proposal to redirect the focus of NASA’s Sustainable Flight Demonstrator project to long, thin-wing ...

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

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

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