The united states is racing to field a hypersonic spy and strike aircraft that can cruise at mach 6, but the new sr-72 darkstar is already drawing warnings that its technical foundations may not match its. It was proposed privately in 2013 by lockheed martin as a successor to the retired lockheed sr-71 blackbird. As of 2025, no confirmed flight tests have occurred and the srโ€‘72 remains a design.

Air dominance.