AA 9950 then AA 2537 at O'Hare
Philadelphia → Chicago → Tucson
Timetable, Chicago time
13:49AA 9950 from Philadelphia at the gate
11:45AA 2537 to Tucson leaves the gate
21 h 56 apart on the timetable, overnight
AA 2537 leaves 21 h 56 after AA 9950 arrives on the timetable: more than half a day, so not a connection we count.