FlyerTalk Forums - View Single Post - How is this possible? (Differences on UG lists)
Old Jan 9, 2017 | 3:29 pm
  #5  
MSPeconomist
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If it's same elite level, fare class, etc., the difference could be the time of upgrade request tiebreaker. One or both of the passengers could have requested the C+ and FC upgrades at different times. Of course, this is unlikely and even more unlikely if there are other people between the two on upgrade lists.

My bet is RUC usage for only FC.
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