Originally Posted by
Jimgotkp
If you're within the upgrade window and there's U space with availability then HUCA and ask them to process the upgrade.
This has worked for me 100% of the time when I'm inside the window and there is U availability (using expertflyer).
"Yes I see there is upgrade availability... hmm, strange you weren't upgraded... hold on a minute... ok you are confirmed in first, anything else I can do for you?"