Forgive me for my ignorance but I am new to the whole Mileage Upgrade Award game. I currently hold an O - Premium Plus ticket from FRA-SFO. If I were to apply a Mileage Upgrade Award, what fare class would I clear into? It says PZ0 presently, yet, when I go to do an MUA it doesn't say anything about having to waitlist as it sometimes does. Would I clear into something other than PZ then if this is correct? Thanks. Also, just to clarify, if I am an O fare class Premier Silver, I will only be behind higher-tier premier members who also have an O fare (since O is highest PP)? Thanks.