AA 2457 then CX 3171 at Houston
Philadelphia → Houston → Anchorage
Timetable, Houston time
21:12AA 2457 from Philadelphia at the gate
17:00CX 3171 to Anchorage leaves the gate
19 h 48 apart on the timetable, overnight
CX 3171 leaves 19 h 48 after AA 2457 arrives on the timetable: more than half a day, so not a connection we count.