JL 6784 then 7C 1126 at Narita
Shanghai → Tokyo → Seoul
Timetable, Tokyo time
09:50JL 6784 from Shanghai at the gate
11:507C 1126 to Seoul leaves the gate
2 h apart on the timetable
The last days
JL 6784 and 7C 1126 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.