AA 5391 then CX 3171 at Houston
Washington National → Houston → Anchorage
Timetable, Houston time
22:18AA 5391 from Washington National at the gate
17:00CX 3171 to Anchorage leaves the gate
18 h 42 apart on the timetable, overnight
CX 3171 leaves 18 h 42 after AA 5391 arrives on the timetable: more than half a day, so not a connection we count.