UA 2649 then WN 643 at Denver
Calgary → Denver → Orlando
Timetable, Denver time
16:36UA 2649 from Calgary at the gate
13:25WN 643 to Orlando leaves the gate
20 h 49 apart on the timetable, overnight
WN 643 leaves 20 h 49 after UA 2649 arrives on the timetable: more than half a day, so not a connection we count.