AA 9950 then AA 3634 at O'Hare
Philadelphia → Chicago → La Crosse
Timetable, Chicago time
13:49AA 9950 from Philadelphia at the gate
10:30AA 3634 to La Crosse leaves the gate
20 h 41 apart on the timetable, overnight
AA 3634 leaves 20 h 41 after AA 9950 arrives on the timetable: more than half a day, so not a connection we count.