Originally Posted by
alextktan
Another follow-up question: say I am trying to upgrade that same flight (or any other international flight) to BusinessPolaris using miles, I know I should look at the "PZ" bucket. Let's assume that bucket is currently at zero. Will United release more seats in the "PZ" bucket? Same question for the "RN" bucket, would United release more as we move forward? Thank you!
Yes, it's possible that either bucket will increase in the future. If they don't, then the waitlist will carry over to the gate. United will upgrade passengers from the list even after boarding (for example, if there's a no-show up front, they'll go on board and give a new boarding pass to the next person in line).