AZ 614 then DL 289 at Boston
Rome → Boston → New York JFK
Timetable, Boston time
13:45AZ 614 from Rome at the gate
18:00DL 289 to New York JFK leaves the gate
4 h 15 apart on the timetable
The last days
AZ 614 and DL 289 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.