Allegedly the project name for the SR-71 replacement.
A vast amount of runours, conjecture, eye-witness sightings and other evidence point to an aircraft, funded as a Black Project, built by the Lockheed Skunk Works, operating out of the Groom Lake / Area 51 location.
Always at night, never photographed, officially denied - sound familiar?
In these pictures, I have used the best available evidence to produce an aircraft which would satisfy both the mission requirements, supposed performance and reports. I have relied heavily on the work of Bill Sweetman, for the technical details. The rest is all conjecture.