Moderator, Marriott Bonvoy & FlyerTalk Evangelist
Join Date: Oct 2002
Location: McKinney, TX, USA
Programs: United Silver; AA Plat/2MM; Marriott LT Titanium; Hilton Gold
Posts: 11,775
I do believe there used to be an entry in Marriott's T&Cs specifically limiting RI upgrades to be from a studio to a 1 bedroom suite. But sometime over the last year or two, they dropped that and now exclude all suite upgrades as a guaranteed part of the upgrade program.