UA 3905 then AS 280 at Houston
Cancún → Houston → Seattle
Timetable, Houston time
13:29UA 3905 from Cancún at the gate
07:02AS 280 to Seattle leaves the gate
17 h 33 apart on the timetable, overnight
AS 280 leaves 17 h 33 after UA 3905 arrives on the timetable: more than half a day, so not a connection we count.