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This was read as a date when the page was transcribed, but it is not one — usually an FBI file or serial number.

AirtelSAC Phoenix to SAC Los Angeles re source's Cooper suspect after Robert Stack TV program19 October 1988 · Phoenix · Part 49 · 1 page

p. 229Communication type marker indicating an AIRTEL (FBI internal routing method). Date of the airtel. Routing block of an FBI AIRTEL from SAC Phoenix to SAC Los Angeles regarding NORJAK (D.B. Cooper hi…