DL 9970 then CI 5175 at San Francisco
Seattle → San Francisco → Taipei
Timetable, San Francisco time
11:15DL 9970 from Seattle at the gate
21:20CI 5175 to Taipei leaves the gate
10 h 05 apart on the timetable
The last days
DL 9970 and CI 5175 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.