UA 3992 then CX 3171 at Houston
Charlotte → Houston → Anchorage
Timetable, Houston time
18:54UA 3992 from Charlotte at the gate
17:58CX 3171 to Anchorage leaves the gate
23 h 04 apart on the timetable, overnight
CX 3171 leaves 23 h 04 after UA 3992 arrives on the timetable: more than half a day, so not a connection we count.