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

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, ...

The tradition of Boeing airplanes having names that start and end with the number 7 began in the 1950s when the company decided to categorize its products by numerical series.