Don't get too excited: We're purely in the 'is this possible' stage right now
The legendary supersonic Concorde jet used to ferry passengers across the Atlantic in just three and a half hours at twice the speed of sound. Impressive, for sure, but NASA now says it's exploring the possibility of doubling that.
Of course, the X-59 isn't nearly as fast as the Mach 2-4 passenger jets NASA is brainstorming, meaning it'll probably be far quieter. Civilian supersonic flights over land are banned in the US and other countries due to sonic boom issues. NASA isn't exploring any overland routes for its Mach 2-4 project, only flight paths that are over sea are being considered.
Mach 2 cruising speed, and official air speed records are currently held by the USAF's SR-71 Blackbird which, reaching speeds of 2,193 mph , only made it to Mach 2.85.scramjets and gliders used as missiles, not passenger craft.
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