9C 7677 then UA 28 at Changi
Shanghai → Singapore → San Francisco
Timetable, Singapore time
16:409C 7677 from Shanghai at the gate
08:40UA 28 to San Francisco leaves the gate
16 h apart on the timetable, overnight
UA 28 leaves 16 h after 9C 7677 arrives on the timetable: more than half a day, so not a connection we count.