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This is because aerodynamicists have discovered a major
breakthrough that revealed the sonic boom is primarily caused by the shape of the plane; certain plane shapes (e.g., the Concorde) causes a high-pressure area of air being moved around the plane that will
generate a sonic boom. Indeed, Gulfstream right now is working on a Mach 1.8 business shaped so it diffuses that high-pressure zone, which reduces the sonic boom to negligible levels or even zero. And a joint US Air Force/DARPA research project working with Boeing, Lockheed Martin and Northrup Grumman have come to the same conclusions, too.
We may definitely see this new research applied to the Boeing Sonic Cruiser; imagine the final version of the Sonic Cruiser capable of flying Mach 1.6 to 1.8 with 200-225 pax at a range of 6,500 nautical miles, yet because of its shape will have no audiable sonic boom at full speed even flying over land. We're talking about the possibility of cutting LAX-NRT flight times from 12 hours to under 7 hours, or SIN-LHR in just over 10 hours even if the plane has to stop at DXB to refuel.