Summary and Key Points: Project Mayhem is the U.S. Air Force's secret hypersonic program aiming to develop a Mach 10 ...

This Is Strange: The X-43A Hyper-X was NASA's groundbreaking scramjet-powered experimental aircraft, setting records in 2004 by reaching speeds close to Mach 10. Despite its success, the U.S ...

Lockheed calls the SR-72 a "game changer." The jet will be an unmanned hypersonic aircraft. Lockheed claims it will reach speeds topping Mach 6 — over 4,500 mph — and they also want the jet to ...