And A --> C is unfortunately confirmed as well. That will likely mean considerably less availability for confirmable upgrades going forward.
When the schedule change runs this weekend, bookings with confirmed upgrades currently confirmed in A will temporarily change to D. However, before too long these upgrades will change to C.
Right about now might be a good time to lock in domestic upgrades for flights in January/February and beyond.
Originally Posted by
sensei
X --> R for flights booked after January 10, 2017