UA 4551 then UA 5539 at O'Hare
Sioux Falls → Chicago → Moline
Timetable, Chicago time
07:55UA 4551 from Sioux Falls at the gate
21:47UA 5539 to Moline leaves the gate
13 h 52 apart on the timetable
UA 5539 leaves 13 h 52 after UA 4551 arrives on the timetable: more than half a day, so not a connection we count.