5X 5602 then AA 6256 at O'Hare
Louisville → Chicago → Sioux Falls
Timetable, Chicago time
18:075X 5602 from Louisville at the gate
16:47AA 6256 to Sioux Falls leaves the gate
22 h 40 apart on the timetable, overnight
AA 6256 leaves 22 h 40 after 5X 5602 arrives on the timetable: more than half a day, so not a connection we count.