Originally Posted by
MSPeconomist
How do you cancel a SDC request? When you ask to SDC the answer is yes or no. If it's yes, your previous reservation, including any upgrades, should be automatically cancelled. There's no wait list for SDC; that's what SDS is.
Only medallion upgrades get cancelled. GUC/RUC/mileage upgrades carry over. Although some agents will insist otherwise.