Originally Posted by PremiumSeat
I'm aware of YUP's (book into "P"), however, didn't mention them because, in my view, they are useless. You get the worst of all worlds. QUP's (at least the ones I've been buying lately) are refundable for less money.
Except on routes, like SFO-BOS, that don't have a QUP fare. Although there, it is still only a $400 difference on a R/T between YUAUP and FUA2FS.