UA 5020 then UA 5539 at O'Hare
Joplin → Chicago → Moline
Timetable, Chicago time
07:59UA 5020 from Joplin at the gate
21:47UA 5539 to Moline leaves the gate
13 h 48 apart on the timetable
UA 5539 leaves 13 h 48 after UA 5020 arrives on the timetable: more than half a day, so not a connection we count.