DL 2398 then AA 688 at JFK
Atlanta → New York → Miami
Timetable, New York time
17:36DL 2398 from Atlanta at the gate
06:00AA 688 to Miami leaves the gate
12 h 24 apart on the timetable, overnight
AA 688 leaves 12 h 24 after DL 2398 arrives on the timetable: more than half a day, so not a connection we count.