AA 6486 then UA 5853 at O'Hare
Detroit → Chicago → Saginaw
Timetable, Chicago time
17:29AA 6486 from Detroit at the gate
10:29UA 5853 to Saginaw leaves the gate
17 h apart on the timetable, overnight
UA 5853 leaves 17 h after AA 6486 arrives on the timetable: more than half a day, so not a connection we count.