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Old Jul 23, 2017, 10:23 pm
  #6  
sannmann
 
Join Date: Mar 2009
Location: DCA
Programs: UA 1K; *G and *A Top 1000; HHonors Diamond; *$ Gold; Global Entry
Posts: 2,272
Originally Posted by kittiyut
Always keep the email confirmation of the GPU being used (upgrade confirmed or not) - it has the GPU certificate number - which will help with retrieving it back when it goes missing
I have only seen the GPU certificate number when trying to upgrade a LH flight- never when upgrading a UA flight.
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