AA 2475 then UA 5194 at O'Hare
Los Angeles → Chicago → Sioux City
Timetable, Chicago time
05:02AA 2475 from Los Angeles at the gate
00:00UA 5194 to Sioux City leaves the gate
18 h 58 apart on the timetable, overnight
UA 5194 leaves 18 h 58 after AA 2475 arrives on the timetable: more than half a day, so not a connection we count.