DL 5647 then B6 8353 at Boston
Savannah → Boston → New York JFK
Timetable, Boston time
17:15DL 5647 from Savannah at the gate
06:00B6 8353 to New York JFK leaves the gate
12 h 45 apart on the timetable, overnight
B6 8353 leaves 12 h 45 after DL 5647 arrives on the timetable: more than half a day, so not a connection we count.