I have been searching for hours, among all the "Definitive" threads and I can't find a simple answer. The OP says "award inventory not yet available" but that was posted 7 years ago! Is there a specific fare class I can search on the EF "Award and Upgrade" form which will tell me award availability? TPG constantly refers to using the EF engine to find award availability, and I see reference to random two-letter fare codes, but when I search for "R" and "O" (as outlined in the Flyerguide DL Wiki page) nothing *ever* comes up. Makes me think I am not searching for the right thing?

[EDIT: I have just accepted that EF does not show award availability. I just assumed it would no longer be the case after 7 years!]