AA 899 then UA 5194 at O'Hare
Los Angeles → Chicago → Sioux City
Timetable, Chicago time
06:00AA 899 from Los Angeles at the gate
00:00UA 5194 to Sioux City leaves the gate
18 h apart on the timetable, overnight
UA 5194 leaves 18 h after AA 899 arrives on the timetable: more than half a day, so not a connection we count.