Wikipedia got nice list of those projects, as usual most of projects never realize. https://en.wikipedia.org/wiki/Supersonic_transport https://en.wikipedia.org

Wikipedia got nice list of those projects, as usual most of projects never realize. https://en.wikipedia.org/wiki/Supersonic_transport https://en.wikipedia.org/wiki/Supersonic_transport List of potential problems with supersonic jets is also quite long. I guess we've all would love to see progress being made.