KL 9956 then BA 435 at Schiphol
Brussels → Amsterdam → London Heathrow
Timetable, Amsterdam time
07:50KL 9956 from Brussels at the gate
11:35BA 435 to London Heathrow leaves the gate
3 h 45 apart on the timetable
The last days
KL 9956 and BA 435 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.