UA 4366 then DL 5618 at Dulles
Norfolk → Washington → New York JFK
Timetable, Washington time
11:37UA 4366 from Norfolk at the gate
12:35DL 5618 to New York JFK leaves the gate
58 min apart on the timetable
The last days
UA 4366 and DL 5618 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.