UA 3909 then NZ 9166 at San Francisco
Houston → San Francisco → Washington
Timetable, San Francisco time
07:17UA 3909 from Houston at the gate
23:20NZ 9166 to Washington leaves the gate
16 h 03 apart on the timetable
NZ 9166 leaves 16 h 03 after UA 3909 arrives on the timetable: more than half a day, so not a connection we count.