AA 642 then UA 4472 at O'Hare
Dallas-Fort Worth → Chicago → Columbia Regional
Timetable, Chicago time
13:10AA 642 from Dallas-Fort Worth at the gate
09:05UA 4472 to Columbia Regional leaves the gate
19 h 55 apart on the timetable, overnight
UA 4472 leaves 19 h 55 after AA 642 arrives on the timetable: more than half a day, so not a connection we count.