DL 9975 then DL 169 at Boston
Miami (MIA) → Boston → New York JFK
Timetable, Boston time
02:50DL 9975 from Miami (MIA) at the gate
12:52DL 169 to New York JFK leaves the gate
10 h 02 apart on the timetable
Boston’s board gives an arrival time for only about 58% of its flights, so many days show no gate time.
The last days
DL 9975 and DL 169 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.