altmorty
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altmorty OP t1_je6euvy wrote
Reply to comment by erosram in This Swiss hypersonic hydrogen-powered jet will cut flights from Europe to Australia to 4 hours by altmorty
>It's a theoretical design based on a theoretical concept
It can't be clearer. A prototype that's passed tests is not a theoretical design/concept.
Every single tech is expensive to begin with. New tech is almost always initially aimed at the rich, who can afford the expense.