DL 548 then DL 5459 at JFK
Phoenix → New York → Savannah
Timetable, New York time
06:34DL 548 from Phoenix at the gate
18:40DL 5459 to Savannah leaves the gate
12 h 06 apart on the timetable
DL 5459 leaves 12 h 06 after DL 548 arrives on the timetable: more than half a day, so not a connection we count.