Originally Posted by
Dr.Phil
My buddy is Gold. We were traveling on the same flights, but different itineraries. he was checking his flight about a week out, and got an offer to upgrades both ways on all legs for about $90. I'm Diamond. Never saw that offer after viewing my itinerary shortly afterward. Never got upgraded. Not cool, Delta.
There's a main thread about this. Search for FCM. Basically the system offers at random, and the prices are random. One time you could get really cheap, the next time really expensive, etc.
Also is dependent on being a ticket purchased directly from DL. TA, OTA, Corporate tickets, etc don't get them since requires a ticket reissue.