UA 513 then DL 3876 at Denver
Syracuse → Denver → Austin
Timetable, Denver time
10:13UA 513 from Syracuse at the gate
09:42DL 3876 to Austin leaves the gate
23 h 29 apart on the timetable, overnight
DL 3876 leaves 23 h 29 after UA 513 arrives on the timetable: more than half a day, so not a connection we count.