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We had Concorde - it was too expensive to operate safely.

We just didn‘t have enough billionaires back then. Today the Thiels and Musks and Bezos will be able to afford this.

Agree that this is a matter of economic viability rather than technology. Presumably somebody could just go back and resurrect the Roles Royce IP

There would be the nice side benefit of maybe having all these guys in one place, upon an experimental aviation platform.