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Thread: Fare/Upgrade Code for Premium Class? (No, It's Just a Premium Seat Assignment)
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Old Nov 20, 2018 | 3:56 pm
  #5  
VegasGambler
FlyerTalk Evangelist
 
Join Date: Oct 2014
Posts: 10,906
It seems to be at midnight (Pacific Time) on the day that your upgrade window opens. So if you have a noon flight, yeah, about 12hr before

At least this has been my experience.
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