UA 3920 then WS 1543 at Houston
Orlando → Houston → Calgary
Timetable, Houston time
19:47UA 3920 from Orlando at the gate
13:50WS 1543 to Calgary leaves the gate
18 h 03 apart on the timetable, overnight
WS 1543 leaves 18 h 03 after UA 3920 arrives on the timetable: more than half a day, so not a connection we count.