WN 550 then DL 3876 at Denver
Nashville → Denver → Austin
Timetable, Denver time
09:55WN 550 from Nashville at the gate
09:42DL 3876 to Austin leaves the gate
23 h 47 apart on the timetable, overnight
DL 3876 leaves 23 h 47 after WN 550 arrives on the timetable: more than half a day, so not a connection we count.