The XB-1 is the first independently developed supersonic jet in history, and it's a prototype for a future supersonic passenger airplane that aims to make air travel faster and more accessible.

Building a supersonic jet is incredibly challenging, but it's not impossible. It requires a unique approach and a willingness to learn from mistakes along the way.

Boom, a company funded by Y Combinator, is developing a supersonic passenger jet and made significant progress during their batch by securing a $100 million LOI from Richard Branson.

Eight years after their Y Combinator batch, Boom successfully built and flew a supersonic jet, demonstrating the potential of hard tech startups.

Overture, the upcoming supersonic airliner, will carry around 65 passengers, travel at Mach 1.7, and run on 100% sustainable fuel, while also preventing sonic booms from reaching the ground, allowing it to fly over land.

Astrome Mechanica has developed an electric jet engine that is efficient at all speeds, allowing for versatile applications in aviation.

Supersonic travel will enter the market similarly to other technologies, starting at higher price points and gradually becoming more affordable, much like electric cars and smartphones.

AirX pivoted from developing a new medical device to launching a basic version using an existing FDA-approved device, enabling them to go live quickly without extensive regulatory delays.

I initially thought there was no way I could be the one to discover the formula for supersonic passenger flight, but it turned out to be liberating to realize that I could find the flaws in the existing assumptions.