AA 2154 then UA 5539 at O'Hare
Charleston (South Carolina) → Chicago → Moline
Timetable, Chicago time
09:00AA 2154 from Charleston (South Carolina) at the gate
21:47UA 5539 to Moline leaves the gate
12 h 47 apart on the timetable
UA 5539 leaves 12 h 47 after AA 2154 arrives on the timetable: more than half a day, so not a connection we count.