AA 9604 then BA 718 at Heathrow
Charlotte → London → Zurich
Timetable, London time
09:40AA 9604 from Charlotte at the gate
13:55BA 718 to Zurich leaves the gate
4 h 15 apart on the timetable
The last days
AA 9604 and BA 718 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.