Aurora” has signified a rumored SR-71 successor: a stealthy, manned, hypersonic reconnaissance jet said to cruise above Mach 5 or Mach 6 and 100,000 feet. -The tale leans on a cryptic 1985 budget line ...

From the legendary SR-71 Blackbird’s rumored successor to whispers of the elusive Aurora and TR-3B, these aircraft have sparked decades of speculation. Some were proven prototypes, while others exist ...

The new concept is being developed for the Defense Advanced Research Projects Agency’s Speed and Runway Independent Technologies (SPRINT) program. The main aim of SPRINT is to create an X-plane that ...