F9 2818 then DL 3876 at Denver
San Diego → Denver → Austin
Timetable, Denver time
09:59F9 2818 from San Diego at the gate
09:42DL 3876 to Austin leaves the gate
23 h 43 apart on the timetable, overnight
DL 3876 leaves 23 h 43 after F9 2818 arrives on the timetable: more than half a day, so not a connection we count.