AA 4562 then UA 3376 at O'Hare
Indianapolis → Chicago → St Louis
Timetable, Chicago time
11:30AA 4562 from Indianapolis at the gate
11:00UA 3376 to St Louis leaves the gate
23 h 30 apart on the timetable, overnight
UA 3376 leaves 23 h 30 after AA 4562 arrives on the timetable: more than half a day, so not a connection we count.