AA 9950 then UA 752 at O'Hare
Philadelphia → Chicago → Washington National
Timetable, Chicago time
13:49AA 9950 from Philadelphia at the gate
12:29UA 752 to Washington National leaves the gate
22 h 40 apart on the timetable, overnight
UA 752 leaves 22 h 40 after AA 9950 arrives on the timetable: more than half a day, so not a connection we count.