I realize that these may appear to be stupid questions but between CPU and GPU and Y/B/M and Y,B,M,E,U,H,Q,V or W class I’ve completely confused myself.

1: For an international flight, if R booking class is available and a Premier 1K with an available GPU has a purchased 016 ticket in Y,B,M,E,U,H,Q,V or W booking class, that person can call United to request the upgrade and the upgrade should be cleared at that time?

2: Exact same question and parameters as #1 except Z,P,S,T,K,L,G or N booking class. The UA agent should say “no, that booking class is not eligible for an upgrade”?

3: Exact same question and parameters as #1 except no R booking class available, the request will go to a waitlist?

4: If waitlisted, more than 24 hours ahead of flight time, one cannot know or be told (by a UA rep) the number of people waitlisted (for an upgrade) nor one’s relative priority position on the waitlist?

5: If waitlisted and number one in priority, if and when R booking class becomes available, the upgrade should clear automatically? But that doesn’t always occur and sometimes it’s possible to call and have the upgrade cleared? Even if one is not number one in priority on the waitlist?

Thanks very much. I appreciate the assistance with helping to stop my head from spinning.