B6 478 then DL 798 at JFK
Jacksonville → New York → Phoenix
Timetable, New York time
18:00B6 478 from Jacksonville at the gate
17:30DL 798 to Phoenix leaves the gate
23 h 30 apart on the timetable, overnight
DL 798 leaves 23 h 30 after B6 478 arrives on the timetable: more than half a day, so not a connection we count.