AA 4756 then DL 5123 at JFK
Indianapolis → New York → Jacksonville
Timetable, New York time
18:29AA 4756 from Indianapolis at the gate
18:20DL 5123 to Jacksonville leaves the gate
23 h 51 apart on the timetable, overnight
DL 5123 leaves 23 h 51 after AA 4756 arrives on the timetable: more than half a day, so not a connection we count.