DL 5850 then DL 1651 at JFK
Jacksonville → New York → Fort Lauderdale
Timetable, New York time
14:40DL 5850 from Jacksonville at the gate
17:30DL 1651 to Fort Lauderdale leaves the gate
2 h 50 apart on the timetable
The last days
DL 5850 and DL 1651 weren’t both flown 15 min to 12 h apart in the last 21 days.
Statistics from past flights, not live flight information. Always check times and your connection with your airline, and don’t base travel or booking decisions on these numbers.