What was the cost of building the SR-71 blackbird?

The cost of building the SR-71 Blackbird was approximately $33 million per aircraft in the 1960s, which translates to around $150 million when adjusted for inflation to 2023 dollars. The total program cost for the SR-71, including research and development, is estimated to be over $3 billion. Its high price tag reflected advanced technology and materials used in its design, aimed at achieving unprecedented speed and altitude for reconnaissance missions.