On UA 4497 today, my wife (Silver) and I (Platinum) were #1 and 2 on the upgrade list with 8 of 10 booked. 1CD went out empty. My sense is that the gate agent was new or inexperienced (she was reading pre-boarding order off of a paper). Still pretty disappointing, I wish I had said something during boarding but figured they'd just pull us up before departure. I did notice the standby list was cleared.

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