How the YF-12 set Mach 3 records and powered NASA research that shaped the SR-71 and future supersonic aircraft.

The history of military aviation is, in a few ways, a story of pushing speed to its limits.

The SR-71 did not simply fade into a museum corner; it left service with the same aura of speed and mystery that defined its entire career. Its retirement years were framed by record-setting dashes ...