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CNN
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The skies over the United States could be wide open for much faster air travel in the near future. Not just because passenger planes capable of breaking the sound barrier are in development — for the first time ever, they could be allowed to do it over American soil.
Even during the days of Concorde, the supersonic plane that retired in 2003, commercial flying at speeds above Mach 1 over mainland US was strictly forbidden, largely due to concerns over noise pollution from sonic booms.
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