UA 5348 then DL 3876 at Denver
Lincoln → Denver → Austin
Timetable, Denver time
10:20UA 5348 from Lincoln at the gate
09:42DL 3876 to Austin leaves the gate
23 h 22 apart on the timetable, overnight
DL 3876 leaves 23 h 22 after UA 5348 arrives on the timetable: more than half a day, so not a connection we count.