Original Member and FlyerTalk Evangelist
Join Date: May 1998
Location: Kansas City, MO, USA
Programs: DL PM/MM, AA ExPlat, Hyatt Glob, HH Dia, National ECE, Hertz PC
Posts: 16,619
Y cars are not necessarilly upgrades, they're just different. One time I had an A class reserved at BWI, just wanting cheap transportation for the weekend and I received a fabulous YB ... a Nissan Sentra.
The Y designator just means the car is different than the standard cars in the class, not necessarilly better.