AA 6244 then UA 4772 at O'Hare
Detroit → Chicago → Columbia Regional
Timetable, Chicago time
17:32AA 6244 from Detroit at the gate
12:45UA 4772 to Columbia Regional leaves the gate
19 h 13 apart on the timetable, overnight
UA 4772 leaves 19 h 13 after AA 6244 arrives on the timetable: more than half a day, so not a connection we count.