BA 973 then BA 1378 at Heathrow
Berlin → London → Manchester
Timetable, London time
10:55BA 973 from Berlin at the gate
17:30BA 1378 to Manchester leaves the gate
6 h 35 apart on the timetable
The last days
BA 973 and BA 1378 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.