AA 9950 then AA 5316 at O'Hare
Philadelphia → Chicago → Louisville
Timetable, Chicago time
13:49AA 9950 from Philadelphia at the gate
10:11AA 5316 to Louisville leaves the gate
20 h 22 apart on the timetable, overnight
AA 5316 leaves 20 h 22 after AA 9950 arrives on the timetable: more than half a day, so not a connection we count.