AA 2917 then UA 4772 at O'Hare
Miami → Chicago → Columbia Regional
Timetable, Chicago time
18:23AA 2917 from Miami at the gate
12:45UA 4772 to Columbia Regional leaves the gate
18 h 22 apart on the timetable, overnight
UA 4772 leaves 18 h 22 after AA 2917 arrives on the timetable: more than half a day, so not a connection we count.