United Flight 837 and the Air Traffic Control system ORDLAX ca 1963.
UA837/B DC81 470 1600 350 ORD V172 3CE DRCT DSM J60 LAX 241405
National Archives and Records Administration ARC 43449, LI 237.22 A Traveler Meets Air Traffic Control (1963) Federal Aviation Agency. Motion Picture and Photographic Section. (1958 1967).
Great shots of Chicago's Meigs Field in the beginning http://friendsofmeigs.org/

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