EI 3616 then BA 1371 at Manchester
Belfast City → Manchester → London Heathrow
Timetable, Manchester time
13:15EI 3616 from Belfast City at the gate
16:10BA 1371 to London Heathrow leaves the gate
2 h 55 apart on the timetable
The last days
EI 3616 and BA 1371 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.