The Roc was built during a burst of optimism when private spaceflight seemed poised to replace government launch programs.

The Lockheed CL-1201 was the most colossal aircraft ever conceived—a 1,000-foot-wide, nuclear-powered flying fortress ...

Stratolaunch previously announced it received $24.7 million from the Missile Defense Agency for a hypersonic flight test targeted for late 2025.