UA 561 then UA 857 at San Francisco
Kansas City → San Francisco → Shanghai
Timetable, San Francisco time
20:10UA 561 from Kansas City at the gatealso OZ 6318, NZ 9502
12:55UA 857 to Shanghai leaves the gatealso CA 7210
16 h 45 apart on the timetable, overnight
UA 857 leaves 16 h 45 after UA 561 arrives on the timetable: more than half a day, so not a connection we count.