WN 4580 then DL 3876 at Denver
Tucson → Denver → Austin
Timetable, Denver time
09:45WN 4580 from Tucson at the gate
09:42DL 3876 to Austin leaves the gate
23 h 57 apart on the timetable, overnight
DL 3876 leaves 23 h 57 after WN 4580 arrives on the timetable: more than half a day, so not a connection we count.