In 1969, we landed on the moon and flew Concorde. Half a century later, we could do neither. Blake Scholl (@bscholl) founded @boomsupersonic (YC W16), the startup building America’s first supersonic airliner, to change that. At Startup School 2026, he shares how a cardboard mockup with Office Depot seats became XB-1, the first independently developed jet to break the sound barrier, and why founders have to build for both the worst day and the best day. 00:08 — Why the Future Stopped Moving…