The actual passenger-carrying Overture will be delayed from 2023 to the mid-2020s. It will have a first flight and a two-year test series with six aircraft.
It will be able to fly from San Francisco-Tokyo in 5h 30m and Tokyo-Hong Kong in 2h.
The Overture will have 55-75 business-class seats, with a crew of six, including two pilots.
Nextbigfuture Believes Supersonic Planes Will Get Leap-frogged by SpaceX Starship
SpaceX Starship will be able to fly at mach 20 in one stage and travel up to 6000 miles. This will be a speed of 18000 mph.
SpaceX Starship should be able to carry 100 passengers.
SpaceX Starship could have manned test flights by 2023.
Elon Musk says adding two to four Raptor Engines to the Starship will let it go sub-orbital for 6000 miles at mach 20. This would mean trips like San Francisco to Shanghai or New York to Berlin. Many world cities are within 6000 miles of each other.