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Lockheed Martin
Acquired
The Blackbird Spike Inlet System
The SR-71 was the two-seater Air Force version of the single-seater A12 CIA airplane. It cost, I think, $300 million a year just to maintain these things. The most advanced jet engines in the world at the time were the Pratt and Whitney J58. Even the J58s couldn't produce nearly enough thrust on their own to get to Mach 3 plus speeds.
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