Originally Posted by
FFFlyer
Actually, since R - 0 there is only the wait list which now, per AC website, is according to status of person flying, as has been the case at the gate. The status of the upgrade sponsor figures in this case for the upgrade window, ie when the request can be made.
Actually, Stranger has it right in the post above yours. Up until the date of travel, the waitlist is ordered by the status of the upgrade sponsor. Upgrades often clear a couple of days before the flight even if R=0. On the date of travel it's the status of the person flying.