BR 23 then BR 752 at Taipei
Seattle → Taipei → Shanghai
Timetable, Taipei time
04:40BR 23 from Seattle at the gate
12:35BR 752 to Shanghai leaves the gate
7 h 55 apart on the timetable
The last days
BR 23 and BR 752 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.