AA 2878 then WN 469 at Denver
Philadelphia → Denver → Las Vegas
Timetable, Denver time
18:35AA 2878 from Philadelphia at the gate
17:20WN 469 to Las Vegas leaves the gate
22 h 45 apart on the timetable, overnight
WN 469 leaves 22 h 45 after AA 2878 arrives on the timetable: more than half a day, so not a connection we count.