UA 920 then TK 6903 at Heathrow
Chicago → London → Istanbul
Timetable, London time
07:55UA 920 from Chicago at the gate
15:30TK 6903 to Istanbul leaves the gate
7 h 35 apart on the timetable
Today
From the airport’s board at 21:07 London time
08:18UA 920 reached the gate23 min late
15:45TK 6903 left the gate15 min late
7 h 27 between the gates
The last days
UA 920 and TK 6903 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.