Here comes the X-59: Supersonic transport may hold a promise of super-fast travel, but it also promises to be extremely loud – and not just to those on the actual aircraft. That is why the Concorde, which was developed as part of an Anglo-French effort and while operated by British Airways and Air France, was typically only used for travel from Europe to North America. The American SST (supersonic transport) effort was grounded mainly due to noise and environmental concerns. Those concerns remain as multiple European nations and environmental groups seek to stop any comeback of supersonic commercial travel. Earlier...