Originally Posted by chicaloca453
Y/B gets 125% mileage and EQM. So I'm guessing you're not buying those. But there is incentive to buy the most expensive Y fares -- typical upgrade (Y-up and the like) and the 25% mileage bonus.
There is a difference between full-fare and refundable, I believe these are the former I'm buying the latter in a variety of fare classes.