Originally Posted by
dstke
I just booked 2 class B tickets on BR, SFO-TPE round trip, departure 10/25/19. I tried to upgrade using SAUA through UA but got an 'unavailable' reply. After reading more here I checked expertflyer and confirmed no I seats available.
Consensus on FT is actually that SAUA availability is most likely linked to 'Z' class availability, not 'I' class. 'Z' class is not available on EF; you must call in to EVA to inquire. I have no experience with Z space opening up. If your travel dates are flexible, I would definitely seek to rebook to dates where you can confirm the upgrade now. There's little point IMO to paying a premium for B class and not confirming the upgrade immediately. Hopefully you are still within the refund window.