This is pretty cool but this Government expenditure seems at odds with Biden's war on Fossil Fuel. The carbon footprint per passenger mile of this thing has to be enormous but for some reason the article ironically concludes with,

"It's important to innovate responsibly so we return benefits to travelers and do no harm to the environment.' ... Mary Jo Long-Davis, manager of NASA's Hypersonic Technology Project


Here is the article...

https://luxurylaunches.com/travel/nasa-supersonic-...

NASA is developing a supersonic passenger aircraft that will reportedly have a top speed of Mach 4 (~3000mph), which will not make it twice as fast as the Concorde but also faster than the legendary SR-71 Blackbird spy plane that was designed with a top speed of Mach 3.2 (around 2500mph). NASA claims that the proposed supersonic jet will cut down the travel time from New York to London to under one and a half hours. Typically, flights to New York take around eight to nine hours as the current crop of large passenger jets cruise at around 600mph. For comparison, the iconic Concorde that retired two decades ago could maintain Mach 2 (1,348 mph).
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... more at the link

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