I’ll second that. I actually worked with Aerion in the early 2000’s doing some design and rendering work (cover of Aviation Week). It’s been almost 20 years and no full sized flights.
I also know the founder of Boom through Y-Combinator. He’s a software guy that got his pilot’s license in 2013 or something and decided that it would be cool to fly supersonic. No engineering background, and a very pie in the sky (as it were) attitude. They’ve raised a ton of money from Silicon Valley types, hired some good engineers, but ultimately are likely to be bested by physics and economics.
Years ago flew the Concord back and forth to London a number of times. Flying at 60,000 feet and 1,300 miles per hour is a rush.