Regarding Boom there are only two reasonable conclusions one can reach:<p>1. They are a Theranos-style operation<p>2. They are a Madoff-style operation<p>I, a lone aerospace engineer working out of my garage in my spare time, have a better chance of achieving supersonic flight than Boom does.<p>Even their technology demonstrator is an obvious scam. It demonstrates nothing. It does not demonstrate the ability to design, build, or maintain a supersonic passenger airplane, and it doesn't demonstrate any new technologies or materials.<p>The bloatiest of bloated old-school defense contractors can throw together a supersonic prototype for less than $100 million, in fewer than 7 years.