AV 4509 then UA 2127 at San Francisco
Taipei → San Francisco → Los Angeles
Timetable, San Francisco time
15:00AV 4509 from Taipei at the gate
06:00UA 2127 to Los Angeles leaves the gatealso AV 2163, NZ 9260
15 h apart on the timetable, overnight
UA 2127 leaves 15 h after AV 4509 arrives on the timetable: more than half a day, so not a connection we count.