B6 478 then DL 5685 at JFK
Jacksonville → New York → Pittsburgh
Timetable, New York time
18:00B6 478 from Jacksonville at the gate
15:15DL 5685 to Pittsburgh leaves the gate
21 h 15 apart on the timetable, overnight
DL 5685 leaves 21 h 15 after B6 478 arrives on the timetable: more than half a day, so not a connection we count.