BA 843 then BA 1490 at Heathrow
Split → London → Glasgow
Timetable, London time
15:00BA 843 from Split at the gate
18:10BA 1490 to Glasgow leaves the gate
3 h 10 apart on the timetable
The last days
BA 843 and BA 1490 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.