AA 9950 then AA 2791 at O'Hare
Philadelphia → Chicago → Los Angeles
Timetable, Chicago time
13:49AA 9950 from Philadelphia at the gate
10:32AA 2791 to Los Angeles leaves the gate
20 h 43 apart on the timetable, overnight
AA 2791 leaves 20 h 43 after AA 9950 arrives on the timetable: more than half a day, so not a connection we count.