AA 3439 then UA 4550 at O'Hare
Fargo → Chicago → Columbia Regional
Timetable, Chicago time
20:30AA 3439 from Fargo at the gate
19:45UA 4550 to Columbia Regional leaves the gate
23 h 15 apart on the timetable, overnight
UA 4550 leaves 23 h 15 after AA 3439 arrives on the timetable: more than half a day, so not a connection we count.