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Old Mar 23, 2018 | 2:29 pm
  #2  
ffsim
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Join Date: Oct 2009
Location: YUL
Programs: AC SE (*A Gold), Bonvoy Platinum Elite, Hilton Gold, Amex Platinum / AP Reserve, NEXUS, Global Entry
Posts: 5,760
I was in a similar situation a couple of weeks ago: a multi-segment business-or-higher class reward where the first (short) leg was in Y. Air Canada added "I" inventory (Business - Award & Alliance Partner Upgrades) earlier this week and I was able to switch into the business class cabin with a simple phone call.

I'm not 100% sure, but I don't think UA rewards are eligible for upgrade standby on AC flights.
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