Japan Team Successfully Test Engine for Mach 5 Aircraft, Eyeing 2HR Trip to US (mainichi.jp)

20 years. At least they're realistic. Seems Boom is thinking 2029-2030 for their operation (https://flightplan.forecastinternational.com/2025/08/25/boom...). Only time will tell

Great sounds like something that should be built. Sounds like a job for a country Japan, South Korea, or China that's willing to execute a project over the long-term.

Building supersonic passenger planes was never a technical problem (see Concorde), the problem is: they are too expensive to operate to be profitable. I bet this thing will never see any commercial use.

Casually mentioning space travel along with passenger service makes me think this isn’t a serious project.

(did anyone else think of speed racer?)

Now the question is whether there will be a significant number of people willing to travel to the US in 20 years.