UA 1748 then AA 1502 at Charlotte
Chicago O'Hare → Charlotte → Nashville
Timetable, Charlotte time
20:54UA 1748 from Chicago O'Hare at the gate
20:05AA 1502 to Nashville leaves the gate
23 h 11 apart on the timetable, overnight
AA 1502 leaves 23 h 11 after UA 1748 arrives on the timetable: more than half a day, so not a connection we count.