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Is supersonic air travel making a comeback?

Remember the Concorde? These luxury jetliners were capable of flying at twice the speed of sound, taking passengers from New York to London in under four hours. High costs and industry setbacks caused the Concorde to be retired in 2003, but private startups, new investors and even NASA are trying to revive the concept of supersonic air travel for the general public. Will it be worth the ticket price? 

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