F9 1500 then DL 3876 at Denver
Ontario → Denver → Austin
Timetable, Denver time
09:51F9 1500 from Ontario at the gate
09:42DL 3876 to Austin leaves the gate
23 h 51 apart on the timetable, overnight
DL 3876 leaves 23 h 51 after F9 1500 arrives on the timetable: more than half a day, so not a connection we count.