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Anyone got any idea what's the status of that X1 thingy which was supposed to be like Concord fast but still affordable by peasant class

Are you thinking of Boom Supersonic?

I know next to nothing about aviation or economics, but my gut feeling is a plane with ~80 seats for international flights will be expensive.

Yup, boom supersonic indeed. I remember reading somewhere that they were also working on a ~200 capacity model

> ~80 seats for international flights will be expensive.

Also, it sounds like a lot of GHG emissions per passenger-mile.