UA 5192 then AA 6246 at O'Hare
Jacksonville → Chicago → Nashville
Timetable, Chicago time
17:30UA 5192 from Jacksonville at the gate
15:05AA 6246 to Nashville leaves the gate
21 h 35 apart on the timetable, overnight
AA 6246 leaves 21 h 35 after UA 5192 arrives on the timetable: more than half a day, so not a connection we count.