UA 576 then AA 3484 at O'Hare
Minneapolis → Chicago → St Louis
Timetable, Chicago time
13:00UA 576 from Minneapolis at the gate
09:30AA 3484 to St Louis leaves the gate
20 h 30 apart on the timetable, overnight
AA 3484 leaves 20 h 30 after UA 576 arrives on the timetable: more than half a day, so not a connection we count.