UA 2278 then BR 1027 at San Francisco
San Diego → San Francisco → Taipei
Timetable, San Francisco time
21:25UA 2278 from San Diego at the gatealso CM 2519, AC 4236, VA 8439
00:10BR 1027 to Taipei leaves the gatealso TG 6290
2 h 45 apart on the timetable, overnight
The last days
UA 2278 and BR 1027 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.