Originally Posted by
thatmikereed
I believe American still treats Premium Economy as an Economy class ticket as you can't "upgrade" to Premium Economy with miles (and aren't forced to by PE to upgrade to Business with miles, etc.) since there isn't a "class of service" below that.
Not wvwn close to correct. Premium Economy is a separate class of service. It is just not possible for some unknowm reason to yet upgrade using miles to PE