At my former airline we would announce a cancelled flight on the radio by saying "Attention all Operations Personnel: Flight 1234 is missing from revision 2 of the flight schedule. Further information on this flight may now be found on Channel 13." The management at this company was under the impression that announcing a cancelled flight would cause mass hysteria in the terminal! Naturally, we adopted this term for other things that we considered "finished:" broken equipment was referred to as "channel 13'd" and an employee who had been terminated or resigned was the same, as in "Bob is 13."
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