UA 302 then DL 3876 at Denver
Detroit → Denver → Austin
Timetable, Denver time
10:17UA 302 from Detroit at the gate
09:42DL 3876 to Austin leaves the gate
23 h 25 apart on the timetable, overnight
DL 3876 leaves 23 h 25 after UA 302 arrives on the timetable: more than half a day, so not a connection we count.