Also works to check far-out waitlists if you change your date in your phone/tablet/computer. I booked a ticket for Feb with a waitlisted GPU request. Saw the upgrade list was 9 deep before booking. Requested my GPU upgrade and I’m 3rd on the list now (as a 1K on a PremiumPlus A fare). If I’d have been 9th or 10th, I’d have canceled and booked another flight. (I realize the list is dynamic).