CK 221 then UA 2210 at LAX
Shanghai → Los Angeles → Boston
Timetable, Los Angeles time
10:00CK 221 from Shanghai at the gate
22:45UA 2210 to Boston leaves the gate
12 h 45 apart on the timetable
UA 2210 leaves 12 h 45 after CK 221 arrives on the timetable: more than half a day, so not a connection we count.