AA 2579 then DL 3876 at Denver
Dallas-Fort Worth → Denver → Austin
Timetable, Denver time
12:20AA 2579 from Dallas-Fort Worth at the gate
09:41DL 3876 to Austin leaves the gate
21 h 21 apart on the timetable, overnight
DL 3876 leaves 21 h 21 after AA 2579 arrives on the timetable: more than half a day, so not a connection we count.