This seems like a nice proof of concept project but it will never be economically viable. So excuse the pun, but it will never take off. If I remember correctl

This seems like a nice proof of concept project but it will never be economically viable. So excuse the pun, but it will never take off. If I remember correctly you can't fly commercial aircraft and even mach speeds over the US, if I remember that's why concord didn't really make any money (among other reasons.)