UA 3910 then WS 1543 at Houston
Washington → Houston → Calgary
Timetable, Houston time
14:30UA 3910 from Washington at the gate
13:50WS 1543 to Calgary leaves the gate
23 h 20 apart on the timetable, overnight
WS 1543 leaves 23 h 20 after UA 3910 arrives on the timetable: more than half a day, so not a connection we count.