Lockheed Martin's hypersonic spy plane, the SR-72, may be in production in secret, emerging evidence suggests

The SR-72, a successor to the SR-71 Blackbird, may still be secretly under development, evidence suggests, as the Air Force faces ongoing budget woes.

https://www.businessinsider.com/lockheed-potentially-developing-sr72-hypersonic-spy-plane-secret-2024-8