UA 231 then AA 5111 at Charlotte
Denver → Charlotte → Manchester
Timetable, Charlotte time
15:14UA 231 from Denver at the gate
13:57AA 5111 to Manchester leaves the gate
22 h 43 apart on the timetable, overnight
AA 5111 leaves 22 h 43 after UA 231 arrives on the timetable: more than half a day, so not a connection we count.