I think the term is https://en.wikipedia.org/wiki/Transonic https://en.wikipedia.org/wiki/Transonic Which is not what they are made for, and can't sustain. Thi

I think the term is https://en.wikipedia.org/wiki/Transonic https://en.wikipedia.org/wiki/Transonic Which is not what they are made for, and can't sustain. This is the same like the stories of airliners going Mach 1,000001 for short times during testing, usually going down, not even horizontal. This is not anything like the envisioned Mach 1.5+ or Mach 2+whatever envisioned by some startups.