I am a Diamond who just used a Global Upgrade for DL417 LAX to SYD that was actually cleared immediately weeks ago, while my return request stated "system wide upgrade requested. On my outbound, a series of events for my connections caused a reissue of my ticket while I was en route to LAX and when I got there, I discovered that my return flight now says "upgrade not available" as it does without a GU request; however, there is now a segment underneath that has my name, business class listed, "no seat assigned", and then says "wait listed" - any idea what this is and which is better? I asked the Diamond Line and the Skyclub in LA and they both said the certificate number is still in and I am listed, just not cleared. I have never seen that phantom segment like that. By the way, there are 16 seats open still in Business.

Thanks for the advice.