FM 853 then TG 640 at Bangkok
Shanghai → Bangkok → Tokyo Narita
Timetable, Bangkok time
22:25FM 853 from Shanghai at the gate
22:30TG 640 to Tokyo Narita leaves the gate
5 min apart on the timetable
The last days
FM 853 and TG 640 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.