NASA and Boeing have effectively cancelled the X-66 Transonic Truss-Braced Wing (TTBW) concept demonstrator aircraft.

Boeing this summer will stop developing NASA's X-66 truss-braced-wing demonstrator aircraft and shift its focus specifically ...

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

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 ...

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

Boeing is pumping the brakes on its experimental X-66 flight demonstrator. The aircraft—being developed with a transonic truss-braced wing—is on “pause for later consideration” after ...