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If commercial flights are carrying passengers at supersonic speeds in the next two decades, I'll be very surprised.

For business/first class routes, I don’t see why not.

The Concorde couldn’t keep up economically, but it’s also a 40 year old design.

BA 001 is a great example of this concept. It’s a flight designed entirely to save business travelers from going to Heathrow. London City to JFK with a fuel stop and pre-clearance in Ireland. Business class only.

Do you have to de-plane during the fuel stop to do the pre-clearance? Or do they do that right on the tarmac?

Judging by the articles I've read on it it seems like they do de-plane briefly, it's just described as a "stopover."

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