DL 2647 then DL 4907 at JFK
Tampa → New York → Chicago O'Hare
Timetable, New York time
14:38DL 2647 from Tampa at the gate
15:24DL 4907 to Chicago O'Hare leaves the gate
46 min apart on the timetable
The last days
DL 2647 and DL 4907 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.