One Upgrade Cleared Right Away The Other Waitlisted
I booked a round trip from San Francisco to Taipei in premium economy and made an award upgrade for both flights to business class. The sfo to tpe BR7 flight is in early July the upgrade cleared right away while the tpe to sfo BR28 flight is in early August put me on waitlist. Does the airline hold upgrades until 90 days before departure or is this something else?