United Mileage Plus award blocking (on other airlines' flights)
A recurring theme in the United forum, and posted also in partner airline forums, is why United Mileage Plus members often cannot get awards on partner airlines that appear to be available using the various tools showing award availability?
Asiana (OZ) is just the latest in a long line of airlines that United Mileage Plus restricts awards on.
Do other frequent flyer programs (FFPs) similarly restrict awards on their partners? This kind of information is invaluable to those selecting a program, as the ability to redeem on partner airlines (especially those in the same airline alliance) is touted as a major FFP benefit. To the extent those awards are not available the program is devalued (slightly for some or significantly for others, depending on your desired redemptions).