The Telegraph: A prototype of a passenger jet meant to succeed Concorde will attempt to break the sound barrier for the first time on Tuesday. Boom Supersonic’s XB-1 demonstrator is set to exceed Mach 1 (770 mph) in a series of four-minute runs above the Mojave Desert in California. The US firm hopes it will pave the way for the introduction of passenger services early next decade. The flight is expected to last be...

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