They lowest I have ever seen on UA was 100%. I fly DL and am Elite level with them. I flew UA only once, 4 segments and they were all JAMMED! This was also the summer when the pilots were playing games and not showing up. My flights LGA-DEN-PHX-DEN-LGA were all 100% full in ALL cabins.
I like UA, too bad they don't fly to ISP.
SR