WN 551 then WN 643 at Denver
Austin → Denver → Orlando
Timetable, Denver time
17:15WN 551 from Austin at the gate
13:25WN 643 to Orlando leaves the gate
20 h 10 apart on the timetable, overnight
WN 643 leaves 20 h 10 after WN 551 arrives on the timetable: more than half a day, so not a connection we count.