AA 1121 then AA 5543 at Charlotte
Los Angeles → Charlotte → Pittsburgh
Timetable, Charlotte time
15:44AA 1121 from Los Angeles at the gate
08:35AA 5543 to Pittsburgh leaves the gate
16 h 51 apart on the timetable, overnight
AA 5543 leaves 16 h 51 after AA 1121 arrives on the timetable: more than half a day, so not a connection we count.