I'm trying to book a specific Q-UP fare but I want to ensure that it books into Z rather than P class. I was able to construct some itineraries by entering Z into the "Enter specific classes of service" box, but I noticed that this excludes any flights that have no upper class cabin. (E.g. I want to book YUL-EWR-DEN-SFO in Z, but since YUL-EWR is Y-only UA returns an error.)
Is there a way to search for these itineraries online, or will I have to call to book this?
Is there a way to search for these itineraries online, or will I have to call to book this?