Originally Posted by
Radiocycle
If you are a Diamond Medallion on DL and you didnt buy a basic economy ticket you are eligible for an upgrade on Delta.
What is your fare basis? What class of service?
If you have a non published consolidators fare it probably doesnt qualify for upgrades, but you would need to provide more information about what type of ticket you purchased, a consolidator ticket, or a published fare and what the fare basis is for the delta segment.
RC
DL uses special classes for comp upgrades which are unique to DL - SU for C+ and OU for FC. The upgrade processor will not process flights which are not DL coded which is the case for OP. This has been noted here numerous times. DL website has only stated that such flights are eligible for day of departure upgrades but doesn't go into details on how these work.