The Concorde jet flew for nearly 30 years before it went out of service. And now, the time airline passengers spend in security lines wastes far more time than a supersonic jet could make up in the air (depending on the journey, of course). Still, traveling fast is cool
, regardless if it's done by air or in an evacuated tube -- as long as it's fast
. Perhaps there's some analogy to the Skyscraper Index
where supersonic transportation designs arise right before an economic recession... so maybe hold off on buying a high-speed ticket to London.
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