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Old Mar 27, 18, 3:44 pm
Join Date: Apr 2015
Location: YVR
Programs: UA Premier Platinum
Posts: 3,321
As far as I know, only AC-issued award tickets are eligible for SDC. Voluntary changes to a MileagePlus ticket can only be made through MP if and when I space is available on the later flight (or X if you're willing to downgrade to confirm on the later flight).

Also, on AC unlike United "SDC" is "same calendar day" not 24 hours before, and it can only be done at the airport.
eigenvector is offline