DL 519 then WN 1817 at Denver
Atlanta → Denver → San Francisco
Timetable, Denver time
18:31DL 519 from Atlanta at the gate
18:20WN 1817 to San Francisco leaves the gate
23 h 49 apart on the timetable, overnight
WN 1817 leaves 23 h 49 after DL 519 arrives on the timetable: more than half a day, so not a connection we count.