[_fizz_buzz_]

Harsh! I think Boom is trying to be SpaceX. A technology that is definitely possible, but pretty difficult to pull off as a start-up. But saying they are Theranos or Madoff is unfair. If they succeed to make the technology work and then succeed to make it profitable is of course not obvious at this point.

[ghaff]

I'd argue there's a significant market for the pre-SpaceX rockets--which are still used today. There's just a much larger potential market for significantly cheaper rockets given sufficient reliability as well.

There is on the other hand no apparent market for commercial supersonic passenger flight given the economics. That doesn't mean that some people wouldn't pay the freight but that there hasn't been enough apparent market to build an airplane program around that.