AA 812 then DM 5103 at Miami
Austin → Miami → Punta Cana
Timetable, Miami time
16:00AA 812 from Austin at the gate
15:02DM 5103 to Punta Cana leaves the gate
23 h 02 apart on the timetable, overnight
DM 5103 leaves 23 h 02 after AA 812 arrives on the timetable: more than half a day, so not a connection we count.