AA 3178 then UA 4772 at O'Hare
Charlotte → Chicago → Columbia Regional
Timetable, Chicago time
17:29AA 3178 from Charlotte at the gate
12:45UA 4772 to Columbia Regional leaves the gate
19 h 16 apart on the timetable, overnight
UA 4772 leaves 19 h 16 after AA 3178 arrives on the timetable: more than half a day, so not a connection we count.