DL 2398 then B6 2718 at JFK
Atlanta → New York → Boston
Timetable, New York time
17:36DL 2398 from Atlanta at the gate
06:40B6 2718 to Boston leaves the gate
13 h 04 apart on the timetable, overnight
B6 2718 leaves 13 h 04 after DL 2398 arrives on the timetable: more than half a day, so not a connection we count.