Supersonic airliner developer Boom has slipped first flight of its XB-1 demonstrator to 2020, but says the follow-on full-size airliner is still on track to debut in the 2025-2027 timeframe. The XB-1, a one-third-scale demonstrator for the company’s Mach 2.2 Overture supersonic airliner, is due to start flight tests in Mojave, California, early next year. The FAA, meanwhile, has announced plans to initiate two rulemaking effort aimed at simplifying the regulatory requirements for civil ...


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