UA 5103 then DL 3876 at Denver
Pierre → Denver → Austin
Timetable, Denver time
11:50UA 5103 from Pierre at the gate
09:42DL 3876 to Austin leaves the gate
21 h 52 apart on the timetable, overnight
DL 3876 leaves 21 h 52 after UA 5103 arrives on the timetable: more than half a day, so not a connection we count.