AA 9950 then AA 3051 at O'Hare
Philadelphia → Chicago → Washington National
Timetable, Chicago time
13:49AA 9950 from Philadelphia at the gate
10:55AA 3051 to Washington National leaves the gate
21 h 06 apart on the timetable, overnight
AA 3051 leaves 21 h 06 after AA 9950 arrives on the timetable: more than half a day, so not a connection we count.