AA 9950 then AA 6486 at O'Hare
Philadelphia → Chicago → Detroit
Timetable, Chicago time
13:49AA 9950 from Philadelphia at the gate
13:34AA 6486 to Detroit leaves the gate
23 h 45 apart on the timetable, overnight
AA 6486 leaves 23 h 45 after AA 9950 arrives on the timetable: more than half a day, so not a connection we count.