UA 598 then WN 1749 at Denver
Tucson → Denver → Dallas
Timetable, Denver time
08:27UA 598 from Tucson at the gate
05:35WN 1749 to Dallas leaves the gate
21 h 08 apart on the timetable, overnight
WN 1749 leaves 21 h 08 after UA 598 arrives on the timetable: more than half a day, so not a connection we count.