AA 9950 then AA 1366 at O'Hare
Philadelphia → Chicago → Denver
Timetable, Chicago time
13:49AA 9950 from Philadelphia at the gate
11:54AA 1366 to Denver leaves the gate
22 h 05 apart on the timetable, overnight
AA 1366 leaves 22 h 05 after AA 9950 arrives on the timetable: more than half a day, so not a connection we count.