NASA has had to be creative in its bid to return to manned X-plane flight research within a constrained budget. Its first move was the relatively modest X-57 Maxwell, an electric propulsion demonstrator based on a light general-aviation aircraft that is now expected to fly in 2019. The next step is much bigger: the X-59 QueSTT low-boom flight demonstrator. The program passed a key decision point in November,  and the aircraft is expected to fly early in 2022. But to fit this ...

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