UA 3878 then AS 439 at Houston
IAB → Houston → Seattle
Timetable, Houston time
22:40UA 3878 from IAB at the gate
14:27AS 439 to Seattle leaves the gate
15 h 47 apart on the timetable, overnight
AS 439 leaves 15 h 47 after UA 3878 arrives on the timetable: more than half a day, so not a connection we count.