AA 595 then AA 3484 at O'Hare
Philadelphia → Chicago → St Louis
Timetable, Chicago time
11:04AA 595 from Philadelphia at the gate
09:30AA 3484 to St Louis leaves the gate
22 h 26 apart on the timetable, overnight
AA 3484 leaves 22 h 26 after AA 595 arrives on the timetable: more than half a day, so not a connection we count.