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Old Jun 11, 19, 3:20 pm
  #4  
ljwobker
 
Join Date: May 2003
Location: RDU, NC, USA
Programs: UA 1K/MM, Hilton something
Posts: 816
Interesting. All the fare codes I see (at least for RDU-SFO) are not of the -UP format. I was bored and built out this (from expertflyer....)

https://docs.google.com/spreadsheets...it?usp=sharing

If you look, the price difference is consistent, as is the formatting... but it appears that Xliioper is right - you have to look individually into the routing codes to be sure. ;(
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