AA 3880 then AA 5406 at Charlotte
Greensboro → Charlotte → Knoxville
Timetable, Charlotte time
19:39AA 3880 from Greensboro at the gate
19:30AA 5406 to Knoxville leaves the gate
23 h 51 apart on the timetable, overnight
AA 5406 leaves 23 h 51 after AA 3880 arrives on the timetable: more than half a day, so not a connection we count.