SQ 34 then TP 4392 at San Francisco
Singapore → San Francisco → Boston
Timetable, San Francisco time
18:35SQ 34 from Singapore at the gate
10:44TP 4392 to Boston leaves the gate
16 h 09 apart on the timetable, overnight
TP 4392 leaves 16 h 09 after SQ 34 arrives on the timetable: more than half a day, so not a connection we count.