F9 2552 then AA 5483 at Philadelphia
Atlanta → Philadelphia → Pittsburgh
Timetable, Philadelphia time
18:19F9 2552 from Atlanta at the gate
14:30AA 5483 to Pittsburgh leaves the gate
20 h 11 apart on the timetable, overnight
AA 5483 leaves 20 h 11 after F9 2552 arrives on the timetable: more than half a day, so not a connection we count.