CDAC01866: US Air Operations over Canadian Territory (Jan 10, 1951)

This document gives clearance for an overflight operation contingent on three parameters: that aircraft fly late at night, singly, and avoid major population centres. These measures served both the secrecy and safety of the operations and would remain integral to overflight clearance well into the program’s prime.

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RG25-A-3-b, Volume number: 5910, File number: 50195-40, pt 1