UA 3914 then AS 439 at Houston
Chicago → Houston → Seattle
Timetable, Houston time
23:27UA 3914 from Chicago at the gate
14:27AS 439 to Seattle leaves the gate
15 h apart on the timetable, overnight
AS 439 leaves 15 h after UA 3914 arrives on the timetable: more than half a day, so not a connection we count.