UA 472 then DL 3876 at Denver
Memphis → Denver → Austin
Timetable, Denver time
10:18UA 472 from Memphis at the gate
09:42DL 3876 to Austin leaves the gate
23 h 24 apart on the timetable, overnight
DL 3876 leaves 23 h 24 after UA 472 arrives on the timetable: more than half a day, so not a connection we count.