UA 724 then WN 1749 at Denver
El Paso → Denver → Dallas
Timetable, Denver time
08:53UA 724 from El Paso at the gate
06:05WN 1749 to Dallas leaves the gate
21 h 12 apart on the timetable, overnight
WN 1749 leaves 21 h 12 after UA 724 arrives on the timetable: more than half a day, so not a connection we count.