AA 1831 then AA 5543 at Charlotte
Key West → Charlotte → Pittsburgh
Timetable, Charlotte time
16:14AA 1831 from Key West at the gate
08:35AA 5543 to Pittsburgh leaves the gate
16 h 21 apart on the timetable, overnight
AA 5543 leaves 16 h 21 after AA 1831 arrives on the timetable: more than half a day, so not a connection we count.