UA 419 then DL 3876 at Denver
Appleton → Denver → Austin
Timetable, Denver time
10:33UA 419 from Appleton at the gate
09:42DL 3876 to Austin leaves the gate
23 h 09 apart on the timetable, overnight
DL 3876 leaves 23 h 09 after UA 419 arrives on the timetable: more than half a day, so not a connection we count.