AA 6486 then UA 4487 at O'Hare
Detroit → Chicago → Dayton
Timetable, Chicago time
17:29AA 6486 from Detroit at the gate
14:40UA 4487 to Dayton leaves the gate
21 h 11 apart on the timetable, overnight
UA 4487 leaves 21 h 11 after AA 6486 arrives on the timetable: more than half a day, so not a connection we count.