Originally Posted by
geminidreams
Given all of these are Star Alliance it is quite feasible to use UA miles for award availability. Ive regularly used my Krisflyer and Miles and Smiles points on other Star Alliance carriers.
SQ and NZ are notoriously stingy in releasing business class award space to partners, especially long-haul. But that would be the only way to use the miles as the upgrade approach would be off the table.