BJ 690 then BA 675 at Istanbul
Tunis → Istanbul → London Heathrow
Timetable, Istanbul time
11:50BJ 690 from Tunis at the gate
18:50BA 675 to London Heathrow leaves the gate
7 h apart on the timetable
Istanbul’s board shows about 81% of departures at their timetable time, so delays of a few minutes don’t show here.
The last days
BJ 690 and BA 675 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.