AA 4190 then UA 4772 at O'Hare
Roanoke → Chicago → Columbia Regional
Timetable, Chicago time
18:15AA 4190 from Roanoke at the gate
12:45UA 4772 to Columbia Regional leaves the gate
18 h 30 apart on the timetable, overnight
UA 4772 leaves 18 h 30 after AA 4190 arrives on the timetable: more than half a day, so not a connection we count.