BA 476 then AT 910 at Barcelona
London Heathrow → Barcelona → Istanbul
Timetable, Barcelona time
11:25BA 476 from London Heathrow at the gate
14:55AT 910 to Istanbul leaves the gate
3 h 30 apart on the timetable
The last days
BA 476 and AT 910 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.