BA 1182 then BA 1406 at Heathrow
New York JFK → London → Belfast City
Timetable, London time
11:10BA 1182 from New York JFK at the gate
17:10BA 1406 to Belfast City leaves the gate
6 h apart on the timetable
The last days
BA 1182 and BA 1406 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.