DL 2398 then DL 5765 at JFK
Atlanta → New York → Boston
Timetable, New York time
17:36DL 2398 from Atlanta at the gate
06:00DL 5765 to Boston leaves the gate
12 h 24 apart on the timetable, overnight
DL 5765 leaves 12 h 24 after DL 2398 arrives on the timetable: more than half a day, so not a connection we count.