Originally Posted by mh4ll

I have a three-segment domestic flight for 2 pax, booked in discount Y, and wanting to upgrade with miles+copay. My understanding is that I need A availability. Current situation per ExpertFlyer is:

Segment 1: A7
Segment 2: A1
Segment 3: A4

Can I go ahead and process miles+copay upgrade (for both passengers) and confirm segment 1 and 3 for both of us, segment 2 for one of us, and waitlist segment 2 for the other? If yes, can I then call back in later if more A availability opens up on segment 2 and get the upgrade processed?