FlyerTalk Forums - View Single Post - UA metal out, CO metal back. How to maximise upgrade chances?
Old Dec 15, 2011 | 4:21 pm
  #9  
channa
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Originally Posted by dalston
Thanks - very helpful. And I take it there is nothing I can do about this?

Does this also work the other way round? There is a decent chance the EAU will clear on the return before the UDU on the outbound given the respective loads on the flights. Would that mean I lose the chance to UDU, or is the glitch only when UA clears ahead of CO

EUA is the finicky one. UDU doesn't care if you're in-sync or not.
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