AA 6486 then AA 6246 at O'Hare
Detroit → Chicago → Nashville
Timetable, Chicago time
17:29AA 6486 from Detroit at the gate
15:05AA 6246 to Nashville leaves the gate
21 h 36 apart on the timetable, overnight
AA 6246 leaves 21 h 36 after AA 6486 arrives on the timetable: more than half a day, so not a connection we count.