UA 5121 then UA 5539 at O'Hare
Eau Claire → Chicago → Moline
Timetable, Chicago time
06:43UA 5121 from Eau Claire at the gate
21:47UA 5539 to Moline leaves the gate
15 h 04 apart on the timetable
UA 5539 leaves 15 h 04 after UA 5121 arrives on the timetable: more than half a day, so not a connection we count.