Since the 2003 end of Concorde, of course, flitting quickly across the Atlantic has been a thing of the past. Flights between London and New York take around eight hours, or closer to seven in the other direction. The record currently stands at just under five hours from New York to London, pushed on by a favorable jetstream.
The study by NASA's Glenn Research Center suggested that there are already "potential passenger markets … in about 50 established routes." These routes were confined to transoceanic ones, including over the North Atlantic and the Pacific, because nations including the U.S. ban overland supersonic flight.
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