Someday I wish AS would fix the annoying glitch with applying guest upgrades to separate reservations....my wife and I are both 75Ks so we typically book separate reservations but in cases where U space opens after booking and we want to use a guest upgrade code, as soon as the agent upgrades one of us, U goes from 2 (or whatever it was at) to zero even though only one of us was upgraded. Its as if taking one U class seat automatically drops U to zero. It happened earlier this year when U was 4 or higher and I tried to upgrade my family of 4 on two separate reservations with upgrade codes....as soon as the first two codes were used for one reservation, U immediately dropped to zero....so annoying.