AA 6486 then AA 5519 at O'Hare
Detroit → Chicago → Louisville
Timetable, Chicago time
17:29AA 6486 from Detroit at the gate
14:42AA 5519 to Louisville leaves the gate
21 h 13 apart on the timetable, overnight
AA 5519 leaves 21 h 13 after AA 6486 arrives on the timetable: more than half a day, so not a connection we count.