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Lockheed Martin SR-72
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The Lockheed Martin SR-72, commonly referred to as "Son of Blackbird", is an American hypersonic concept intended for intelligence, surveillance, and reconnaissance (ISR). 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 SR‑72 remains a design concept with speculation persisting about potential service entry in the 2030s.