Lockheed Martin's Skunk Works has confirmed that it is developing the SR-72 spy plane. The successor to the SR-71 Blackbird, which was capable of Mach 3.5, the SR-72 will be a hypersonic unmanned ...
Key Points - The A-12 Oxcart, developed by Lockheed's Skunk Works for the CIA in the early 1960s, was the single-seat, Mach 3.29 (at 90,000 feet) precursor to the USAF's more famous SR-71 Blackbird.
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