UA 190 then TP 4392 at San Francisco
Manila → San Francisco → Boston
Timetable, San Francisco time
06:35UA 190 from Manila at the gate
22:10TP 4392 to Boston leaves the gate
15 h 35 apart on the timetable
TP 4392 leaves 15 h 35 after UA 190 arrives on the timetable: more than half a day, so not a connection we count.