UA 4546 then AA 3484 at O'Hare
Columbia Regional → Chicago → St Louis
Timetable, Chicago time
13:02UA 4546 from Columbia Regional at the gate
09:30AA 3484 to St Louis leaves the gate
20 h 28 apart on the timetable, overnight
AA 3484 leaves 20 h 28 after UA 4546 arrives on the timetable: more than half a day, so not a connection we count.