AA 4264 then UA 5194 at O'Hare
Sioux Falls → Chicago → Sioux City
Timetable, Chicago time
09:02AA 4264 from Sioux Falls at the gate
00:00UA 5194 to Sioux City leaves the gate
14 h 58 apart on the timetable, overnight
UA 5194 leaves 14 h 58 after AA 4264 arrives on the timetable: more than half a day, so not a connection we count.