AA 4212 then UA 3376 at O'Hare
Providence → Chicago → St Louis
Timetable, Chicago time
14:30AA 4212 from Providence at the gate
11:00UA 3376 to St Louis leaves the gate
20 h 30 apart on the timetable, overnight
UA 3376 leaves 20 h 30 after AA 4212 arrives on the timetable: more than half a day, so not a connection we count.