AA 9950 then AA 531 at O'Hare
Philadelphia → Chicago → Dallas-Fort Worth
Timetable, Chicago time
13:49AA 9950 from Philadelphia at the gate
13:44AA 531 to Dallas-Fort Worth leaves the gate
23 h 55 apart on the timetable, overnight
AA 531 leaves 23 h 55 after AA 9950 arrives on the timetable: more than half a day, so not a connection we count.