K4 550 then MU 728 at Narita
Chicago → Tokyo → Shanghai
Timetable, Tokyo time
08:45K4 550 from Chicago at the gate
13:00MU 728 to Shanghai leaves the gate
4 h 15 apart on the timetable
The last days
K4 550 and MU 728 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.