AF 877 then U2 4525 at Charles de Gaulle
Zanzibar → Paris → Nice
Timetable, Paris time
09:15AF 877 from Zanzibar at the gate
15:45U2 4525 to Nice leaves the gate
6 h 30 apart on the timetable
Charles de Gaulle’s board gives an arrival time for only about 51% of its flights, so many days show no gate time.
The last days
AF 877 and U2 4525 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.