FlyerTalk Forums - View Single Post - Consolidated Global Services Thread: Benefits, Questions 2016
Old Feb 22, 2016 | 7:09 pm
  #265  
narvik
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Join Date: May 2010
Location: AVP & PEK
Programs: UA 1K 2MM
Posts: 7,798
"Global Premier Upgrades are not available on flights booked in fare classes Z, P, S, T, K, L, G or N."

from http://www.cwsi.net/united.htm

EDIT: it's route dependent, so it may work for you. Unfortunately for me it NEVER works, as I ALWAYS fly routes where GPU are not available!
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