AF 9108 then DL 1 at JFK
Porto → New York → London Heathrow
Timetable, New York time
15:25AF 9108 from Porto at the gate
20:00DL 1 to London Heathrow leaves the gate
4 h 35 apart on the timetable
The last days
AF 9108 and DL 1 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.