UA 142 then DL 3876 at Denver
Tokyo → Denver → Austin
Timetable, Denver time
12:15UA 142 from Tokyo at the gate
09:42DL 3876 to Austin leaves the gate
21 h 27 apart on the timetable, overnight
DL 3876 leaves 21 h 27 after UA 142 arrives on the timetable: more than half a day, so not a connection we count.