CM 2457 then BR 1017 at San Francisco
Sacramento → San Francisco → Taipei
Timetable, San Francisco time
21:41CM 2457 from Sacramento at the gatealso UA 5961, VA 8183
00:40BR 1017 to Taipei leaves the gatealso TG 6280
2 h 59 apart on the timetable, overnight
The last days
CM 2457 and BR 1017 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.