B6 478 then DL 1480 at JFK
Jacksonville → New York → Atlanta
Timetable, New York time
18:00B6 478 from Jacksonville at the gate
14:00DL 1480 to Atlanta leaves the gate
20 h apart on the timetable, overnight
DL 1480 leaves 20 h after B6 478 arrives on the timetable: more than half a day, so not a connection we count.