GF 6631 then DL 738 at JFK
London Heathrow → New York → Los Angeles
Timetable, New York time
13:15GF 6631 from London Heathrow at the gate
15:20DL 738 to Los Angeles leaves the gate
2 h 05 apart on the timetable
The last days
GF 6631 and DL 738 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.