ATLANTA – Supersonic flight is arriving—in a hurry. In the last 18 months, Boom has successfully tested its XB-1 demonstrator aircraft and pre-sold 15 of its still-in-development 30-seat Overture models to United AirlinesVirgin Galactic and Rolls Royce rolled out a partnership to develop a 19-seater. Even the Russian Federation revealed plans to build a supersonic jet for commercial use.

Then there’s the Hermeus Quarterhorse. Think supersonic or Mach 1—the speed of sound—multiply by five and you have the hypersonic Quarterhorse.

Last week, the Atlanta-based company announced a $60 million award from the US Air Force to finance testing of the aircraft. Like the Greek god Hermes, this Hermeus is designed to travel seamlessly between worlds, with a projected top speed of Mach 5.5—or 4,219 mph. That makes it the fastest reusable aircraft on the planet, so a New York-to-London flight will take less than an hour.

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