DL 495 then WN 1572 at Atlanta
San Francisco → Atlanta → Denver
Timetable, Atlanta time
06:30DL 495 from San Francisco at the gate
18:40WN 1572 to Denver leaves the gate
12 h 10 apart on the timetable
WN 1572 leaves 12 h 10 after DL 495 arrives on the timetable: more than half a day, so not a connection we count.