Originally Posted by
kamadzu4
I found open Z space on Delta One to Hawaii on 767/330 without Premium Select seats. The Delta site for those flights just indicates:
Delta OneŽ available with Global Upgrade Certificate
Then, on the Express Checkout page, under Upgrade Request with Upgrade Certificates, for the outbound it states "Upgrade Available to First" and on the return it states "Upgrade Available to [nothing]", which implies that the RUCs won't get me into Delta One on those.
Is that correct, and is there some other way to figure out which flights/segments can clear with RUCs? By the way, I only have RUCs in my wallet, no GUCs (haven't been Diamond since 2019).
You need to use GUCs for GUC upgrade inventory (to the last seat…usually). If you want to use RUCs, look for flights where it says RUC space is available (called “upgrade certificate” on the website,
without the “global” in front). Be prepared to look and keep looking across many months and keep doing so for weeks until (and if you ever) come across the rarest of unicorns, that is Delta RUC upgrade on A330/350/767. It can happen, but you need to be very lucky to find it.
As for applying it online, IME that never works (it may only work with GUCs). That option just doesn’t appear then at all. Will take a good half an hour for a res agent to do that for you, and they will claim it’s not available, but stand your ground and they should relent and let you have it in the end.