UA 6138 then AA 5111 at Charlotte
Houston → Charlotte → Manchester
Timetable, Charlotte time
15:54UA 6138 from Houston at the gate
15:30AA 5111 to Manchester leaves the gate
23 h 36 apart on the timetable, overnight
AA 5111 leaves 23 h 36 after UA 6138 arrives on the timetable: more than half a day, so not a connection we count.