Join Date: May 1998
Location: Reno, NV (RNO)
Programs: AA LT Platinum, AS, UA Premier Silver, DL, HHonors Gold, Marriott LT Titanium, Hyatt, IHG Platinum
Posts: 4,723
I haven't seen any upgrade certificates (confirmable or otherwise) in months. Used to be you received confirmable (in advance) upgrades after a certain number of stays. About a year or more ago that was changed to space available (on check-in) upgrades after a certain number of stays.