Originally Posted by
USFdonWill
From my understanding, the reason behind the issue is that your ticket is out of sync. When you get an upgrade on a UA flight, UA does not reissue the ticket to reflect the new class of service. On the other hand, CO will reissue a ticket when there has been an upgrade. Currently, this problem will persist till we are under one reservation system.
Same thing just happened to me. Have a mixed itin - CO is the first segment, UA on the second, was upgraded - and can't check in. CO agent told me specifically it was because of the UA upgrade clearing, and specifically said because of this, my ticket was not "in sync" on the CO side. Said I would just have to check in at the airport.
This means I can't get on the CO EUA list for my first flight - not that I'm even gonna come close on a EWR-ORD flight as a silver, but still....