AA 2742 then AA 2255 at Charlotte
Chicago O'Hare → Charlotte → Pittsburgh
Timetable, Charlotte time
12:09AA 2742 from Chicago O'Hare at the gate
08:55AA 2255 to Pittsburgh leaves the gate
20 h 46 apart on the timetable, overnight
AA 2255 leaves 20 h 46 after AA 2742 arrives on the timetable: more than half a day, so not a connection we count.