WN 668 then WN 1749 at Denver
Phoenix Sky Harbor → Denver → Dallas
Timetable, Denver time
09:25WN 668 from Phoenix Sky Harbor at the gate
05:35WN 1749 to Dallas leaves the gate
20 h 10 apart on the timetable, overnight
WN 1749 leaves 20 h 10 after WN 668 arrives on the timetable: more than half a day, so not a connection we count.