UA 1748 then AA 5815 at Charlotte
Chicago O'Hare → Charlotte → Jacksonville (North Carolina)
Timetable, Charlotte time
20:54UA 1748 from Chicago O'Hare at the gate
20:18AA 5815 to Jacksonville (North Carolina) leaves the gate
23 h 24 apart on the timetable, overnight
AA 5815 leaves 23 h 24 after UA 1748 arrives on the timetable: more than half a day, so not a connection we count.