UA 618 then CX 3171 at Houston
San Diego → Houston → Anchorage
Timetable, Houston time
20:19UA 618 from San Diego at the gate
17:00CX 3171 to Anchorage leaves the gate
20 h 41 apart on the timetable, overnight
CX 3171 leaves 20 h 41 after UA 618 arrives on the timetable: more than half a day, so not a connection we count.