Datapoint here: just upgraded 12/14 ORD-TPE via UA SAUA. I class not available as per Expertflyer. Didn’t call to check Z class.
Interestingly I was ticketed ORD-TPE-HKG with a 1hr connection in TPE, but the ORD-TPE upgrade went through fine and I didn’t encounter the married segment problem.
EDIT: changed some wording for clarification.
Last edited by shd9; Apr 4, 2019 at 5:45 pm