AA 6018 then AA 3268 at Charlotte
Knoxville → Charlotte → Punta Cana
Timetable, Charlotte time
12:22AA 6018 from Knoxville at the gate
07:10AA 3268 to Punta Cana leaves the gate
18 h 48 apart on the timetable, overnight
AA 3268 leaves 18 h 48 after AA 6018 arrives on the timetable: more than half a day, so not a connection we count.