LA 6139 then BR 1027 at San Francisco
Boston → San Francisco → Taipei
Timetable, San Francisco time
00:24LA 6139 from Boston at the gate
00:10BR 1027 to Taipei leaves the gatealso TG 6290
23 h 46 apart on the timetable, overnight
BR 1027 leaves 23 h 46 after LA 6139 arrives on the timetable: more than half a day, so not a connection we count.