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Thread: OY instead of OP ?
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Old May 31, 2017 | 9:55 am
  #10  
flyerwma
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Just my usual request for a wiki, when all the codes are sorted.

I have been using MSPEconomist's helpful mnemonic for OP/RP, that "P" is for "paper", which connotes an instrument (RUC/GUC/mileage) upgrade. And that for OU/RU, "U" is for an ordinary (Medallion) "upgrade".

But I now fear this will get more complicated....
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