AA 2344 then AA 2255 at Charlotte
St Louis → Charlotte → Pittsburgh
Timetable, Charlotte time
12:00AA 2344 from St Louis at the gate
08:55AA 2255 to Pittsburgh leaves the gate
20 h 55 apart on the timetable, overnight
AA 2255 leaves 20 h 55 after AA 2344 arrives on the timetable: more than half a day, so not a connection we count.