BA 9118 then TK 1990 at Heathrow
Orlando → London → Istanbul
Timetable, London time
10:10BA 9118 from Orlando at the gate
15:20TK 1990 to Istanbul leaves the gate
5 h 10 apart on the timetable
The last days
BA 9118 and TK 1990 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.