Supersonic airliner developer Boom Supersonic has slipped the first flight of its XB-1 high-speed demonstrator to 2020, but says the follow-on full-size airliner is on track to make its service debut in the 2025-2027 timeframe. The XB-1, a one-third-scale demonstrator for the company’s proposed 55-seat, Mach 2.2 Overture supersonic airliner, will be rolled out of Boom’s Colorado facility in December before starting flight tests in Mojave, California, early next year. The test ...

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