AA 4639 then DL 5483 at JFK
Boston → New York → Jacksonville
Timetable, New York time
07:30AA 4639 from Boston at the gate
07:15DL 5483 to Jacksonville leaves the gate
23 h 45 apart on the timetable, overnight
DL 5483 leaves 23 h 45 after AA 4639 arrives on the timetable: more than half a day, so not a connection we count.