5X 5602 then UA 5021 at O'Hare
Louisville → Chicago → Sioux City
Timetable, Chicago time
18:075X 5602 from Louisville at the gate
16:20UA 5021 to Sioux City leaves the gate
22 h 13 apart on the timetable, overnight
UA 5021 leaves 22 h 13 after 5X 5602 arrives on the timetable: more than half a day, so not a connection we count.