AA 1418 then LA 591 at Miami
Boston → Miami → Punta Cana
Timetable, Miami time
08:27AA 1418 from Boston at the gate
08:00LA 591 to Punta Cana leaves the gate
23 h 33 apart on the timetable, overnight
LA 591 leaves 23 h 33 after AA 1418 arrives on the timetable: more than half a day, so not a connection we count.