UA 4537 then UA 5539 at O'Hare
Roanoke → Chicago → Moline
Timetable, Chicago time
07:44UA 4537 from Roanoke at the gate
21:47UA 5539 to Moline leaves the gate
14 h 03 apart on the timetable
UA 5539 leaves 14 h 03 after UA 4537 arrives on the timetable: more than half a day, so not a connection we count.