Just found my first advanced upgrade (maybe first ever). Booked in a European city in a couple of weeks on a Thurs/Fri night and booked the standard 1 king room. I made the reservation in May and my start date isn't for another 10+ days. My reservation is now showing the Premium 1 king room which is the highest room tier offered at this hotel. Cash rate hasn't changed. I don't know when the upgrade was actually done as I haven't been checking this reservation.

Europe is summer is usually super busy so I'm sure I got the advanced upgrade to open inventory for the lower category rooms. Just surprising since you would think hotels would rather sell out the lower tier and then only sell the higher tier for more money. Oh well, I'm happy. It's just a quick two night stay on a return trip from the Middle East to the USA.

I'll be taking a screenshot of the mobile app showing the Premium room. Then we will see if it sticks when I check in. I never even tried to use SNAs for this (even though I'm going to have plenty that expire June 30).

-RM