AA 4499 then UA 5194 at O'Hare
Charlottesville → Chicago → Sioux City
Timetable, Chicago time
08:32AA 4499 from Charlottesville at the gate
00:00UA 5194 to Sioux City leaves the gate
15 h 28 apart on the timetable, overnight
UA 5194 leaves 15 h 28 after AA 4499 arrives on the timetable: more than half a day, so not a connection we count.