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In page Project Isinglass:
"Following fourteen months of work, McDonnell had developed the aircraft to the point where serious proposals were made for its construction.[1] However, neither the CIA nor the National Reconnaissance Office had an official requirement for such an aircraft; in addition, the projected cost of the aircraft was astronomical, the cost for eight aircraft being projected to be $2.6 billion USD in 1965 dollars (inflation adjusted US$ 21.09 billion in 2020),[1][2] a sum considered to be far too high for the available budget.[3] In addition, there were concerns that the aircraft's trajectory could be mistaken for that of an incoming ballistic missile.[1]
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