Engines, noise and emissions are at the center of a growing debate over the reintroduction of supersonic travel. U.S. startup Boom Technology is pressing lawmakers and regulators to set less-stringent environmental standards for supersonic transports (SST) to reflect engine technology, but this is being resisted by European aviation authorities and rival aircraft developers. Supersonic travel ended in 2003, when Concorde was retired. Now Boom, along with hopefuls Aerion and Spike Aerospace, ...

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