CK 221 then UA 1853 at LAX
Shanghai → Los Angeles → San Francisco
Timetable, Los Angeles time
10:00CK 221 from Shanghai at the gate
22:35UA 1853 to San Francisco leaves the gate
12 h 35 apart on the timetable
UA 1853 leaves 12 h 35 after CK 221 arrives on the timetable: more than half a day, so not a connection we count.