GF 6607 then DL 5779 at JFK
London Heathrow → New York → Pittsburgh
Timetable, New York time
18:45GF 6607 from London Heathrow at the gate
19:35DL 5779 to Pittsburgh leaves the gate
50 min apart on the timetable
The last days
GF 6607 and DL 5779 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.