AA 6422 then DL 3876 at Denver
Los Angeles → Denver → Austin
Timetable, Denver time
11:46AA 6422 from Los Angeles at the gate
09:42DL 3876 to Austin leaves the gate
21 h 56 apart on the timetable, overnight
DL 3876 leaves 21 h 56 after AA 6422 arrives on the timetable: more than half a day, so not a connection we count.