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Mach 15? NASA’s 1st Hypersonic Jet Concept That Never Flew But Is Still Relevant Today

Hypersonic flight is no longer science fiction. In recent years, interest in aircraft capable of exceeding Mach 5 has surged, driven by strategic competition, defense challenges, and NASA’s pursuit of ...
National Security Journal on MSN

The Mach 6.7 monster: Why the X-15’s speed record still stands in 2026

Summary and Key Points: The X-15 program, spanning 199 flights between 1959 and 1968, pushed the boundaries of aeronautics ...