DL 5745 then DL 45 at Boston
New York LaGuardia → Boston → New York JFK
Timetable, Boston time
12:25DL 5745 from New York LaGuardia at the gate
18:30DL 45 to New York JFK leaves the gate
6 h 05 apart on the timetable
The last days
DL 5745 and DL 45 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.