AA 6018 then AA 5543 at Charlotte
Knoxville → Charlotte → Pittsburgh
Timetable, Charlotte time
12:22AA 6018 from Knoxville at the gate
08:35AA 5543 to Pittsburgh leaves the gate
20 h 13 apart on the timetable, overnight
AA 5543 leaves 20 h 13 after AA 6018 arrives on the timetable: more than half a day, so not a connection we count.