AA 4996 then UA 3376 at O'Hare
Cedar Rapids → Chicago → St Louis
Timetable, Chicago time
12:30AA 4996 from Cedar Rapids at the gate
11:00UA 3376 to St Louis leaves the gate
22 h 30 apart on the timetable, overnight
UA 3376 leaves 22 h 30 after AA 4996 arrives on the timetable: more than half a day, so not a connection we count.