(On the other hand, I typically fly internationally in coach, which often has as much seat and leg room as domestic first class.)
Also, mach 2.2 is more than "slightly" faster than mach 0.8
I can tell you, if it's truly the same price as J, and you get a domestic FC seat -- it's totally worth it. A typical TATL-EastCoast segment is about 7-9 hours long depending on many factors. If they can cut that to 3 hours, it's a huge win.
First of all, it means that instead of leaving the EU Sunday so I can work Monday morning, I could leave Monday morning about 8AM, and arrive in the USA (assume I have one connection, could be on either side) about 8AM. I've just gained an entire (_weekend_) day of my life back.
Now going home, TATL flights are always overnight. Instead though, I could sleep in a normal bed, get up at 4/5am (I try and stay on EU time anyway for my 5-day trips, get up early, go to bed early), and then land same day and be home before dinner -- and not spend the entire arrival day running on 5 hours of (crap) "sleep".
Not true, at least NY to London. You can leave in the AM and arrive (relatively late) at night.
Apparently the Concorde was only purchased/operated by Air France and British Airways, on transAtlantic routes.
The routes given for this plane - across the pacific - are not over land.
Can this plane go supersonic over land?
The problem is not technical, but regulatory. The Concorde's sonic boom was very loud and a big nuisance. That's why it was forbidden.
There are multiple supersonic jets in development (private jets), that all plan on having a much reduced sonic boom that should allow regulations to be lifted. But that will have to be demonstrated to regulators first.
If you can't fly supersonic overland, it severely limits the utility and the possible routes.
Supersonic aircraft are TERRIBLY inefficient when flying subsonic, and use up a lot of fuel when doing so.
Cut it down to five hours, and I'll gladly pay $5000 for a round trip ticket.
As faster satellite wifi becomes a thing the longer flights are tolerable, but it's still time you could be on the ground doing something more useful.
On the other hand, I'm very doubtful about Boom; the fact that they mostly seem to be talking about the passenger cabin does not inspire a ton of confidence, and even if they get their plane built, I have doubts about their ticket price projections.
I suspect that it's highly questionable whether a supersonic design would be able to do the "brutally long" flights without refueling. The market for the Concorde and I imagine the market for this is the CEO/investment banker/international lawyer who wants to do a quick hop from NYC to London or Paris--including day trips.
Edit: also, lovely big windows.