WN 1503 then WN 1749 at Denver
Jacksonville → Denver → Dallas
Timetable, Denver time
10:35WN 1503 from Jacksonville at the gate
05:35WN 1749 to Dallas leaves the gate
19 h apart on the timetable, overnight
WN 1749 leaves 19 h after WN 1503 arrives on the timetable: more than half a day, so not a connection we count.