Oh OK Well Ive never had a GPU or RPU or MUA or SAUA (SAUA even on LX!!) not clear - I choose my flights based on upgrade availability and am flexible for a day plus or minus my preferred travel date It also helps I find to be flexible with departure/arrival times I think of late its actually improved on ua.com Same thing last jluy-august september and also last novemeber JFK-BOS vv JFK-SFO, SFO-SYD
I like to confirm my upgrades at time of ticketing on long routes so use the expert feature on ua.com