Boeing's NASA-backed X-66A Sustainable Flight Demonstrator, a heavily modified McDonnell Douglas MD-90, configured with a new transonic truss-braced wing design is Boeing's first full-scale commercial demonstrator since the 367-80 — the forerunner to the KC-135 and 707. That aircraft advanced the now-familiar swept wing podded engine that has defined commercial aviation for the last seven decades. The X-66A is slated to fly in 2028, a year after JetZero's demonstrator.

Boeing shelves plans to fly NASA X-66 flight demonstrator

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