Originally Posted by
rylan
There is a big difference between an upgrade instrument (RUC/Miles etc) and a medallion upgrade. The medallion upgrade can only SDC based on the original coach bucket. With a RUC it is treated as a first class paid ticket. The upgrade instrument is the method of payment, just like if you had a first class award ticket you can SDC to another seat.
Originally Posted by
DLATL777
As others have stated, THIS is the correct answer.
Yes. It may take asking for a supervisor but you can SDC if you used an RUC or miles to UG because you are treated as having a First/Business/Delta One ticket. Last week a phone agent initially tried to tell me I couldn't SDC to another flight since the UG space wasn't available, but when I pressed and said that since I had been confirmed into the premium cabin with the RUC and therefore should be treated no different than any other premium cabin SDC which only requires an open seat, she put me on hold, spoke with someone, and then processed the change I requested.