UA 1963 then DL 3876 at Denver
Charlotte → Denver → Austin
Timetable, Denver time
10:30UA 1963 from Charlotte at the gate
09:42DL 3876 to Austin leaves the gate
23 h 12 apart on the timetable, overnight
DL 3876 leaves 23 h 12 after UA 1963 arrives on the timetable: more than half a day, so not a connection we count.