Originally Posted by tribe01
I thought mileage upgrades for discounted economy tickets come out of the E bucket not P. P is the bucket for upgraded Full fare economy tickets and premium awards.
When I used miles to upgrade, I was "E" class. When I used upgrade vouchers from a voluntary bump, I was "P." When I first booked a ticket home for Christmas, no P inventory was available and I was waitlisted. I called the reservation line every week until they confirmed me.
Also, in my experience, using miles to upgrade is a definite over freebies.