F9 4353 then AA 5543 at Charlotte
Philadelphia → Charlotte → Pittsburgh
Timetable, Charlotte time
16:40F9 4353 from Philadelphia at the gate
08:35AA 5543 to Pittsburgh leaves the gate
15 h 55 apart on the timetable, overnight
AA 5543 leaves 15 h 55 after F9 4353 arrives on the timetable: more than half a day, so not a connection we count.