WN 591 then DL 3876 at Denver
Baltimore → Denver → Austin
Timetable, Denver time
10:15WN 591 from Baltimore at the gate
09:42DL 3876 to Austin leaves the gate
23 h 27 apart on the timetable, overnight
DL 3876 leaves 23 h 27 after WN 591 arrives on the timetable: more than half a day, so not a connection we count.