UA 543 then UA 5539 at O'Hare
Buffalo → Chicago → Moline
Timetable, Chicago time
07:33UA 543 from Buffalo at the gate
21:47UA 5539 to Moline leaves the gate
14 h 14 apart on the timetable
UA 5539 leaves 14 h 14 after UA 543 arrives on the timetable: more than half a day, so not a connection we count.