Under its New Aviation Horizons initiative, NASA proposes building a series of large-scale X-planes over 10 years to demonstrate technologies for future ultra-efficient subsonic transports. To get a head start, the agency has awarded six-month contracts to develop the system requirements for flight demonstrators in five different configurations. The next step, funding permitting, will be a competition to take the first X-plane to a preliminary design review. These are the five ...


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