DL 2398 then B6 1602 at JFK
Atlanta → New York → Buffalo
Timetable, New York time
17:36DL 2398 from Atlanta at the gate
06:44B6 1602 to Buffalo leaves the gate
13 h 08 apart on the timetable, overnight
B6 1602 leaves 13 h 08 after DL 2398 arrives on the timetable: more than half a day, so not a connection we count.