UA 2680 then CX 3171 at Houston
Phoenix → Houston → Anchorage
Timetable, Houston time
23:33UA 2680 from Phoenix at the gate
17:58CX 3171 to Anchorage leaves the gate
18 h 25 apart on the timetable, overnight
CX 3171 leaves 18 h 25 after UA 2680 arrives on the timetable: more than half a day, so not a connection we count.