JL 6720 then 7C 1164 at Narita
Shanghai → Tokyo → Busan
Timetable, Tokyo time
08:07JL 6720 from Shanghai at the gate
14:057C 1164 to Busan leaves the gate
5 h 58 apart on the timetable
The last days
JL 6720 and 7C 1164 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.