AA 9950 then UA 4445 at O'Hare
Philadelphia → Chicago → Birmingham (Alabama)
Timetable, Chicago time
13:49AA 9950 from Philadelphia at the gate
10:29UA 4445 to Birmingham (Alabama) leaves the gate
20 h 40 apart on the timetable, overnight
UA 4445 leaves 20 h 40 after AA 9950 arrives on the timetable: more than half a day, so not a connection we count.