UA 1537 then WN 4313 at Denver
Philadelphia → Denver → Burbank
Timetable, Denver time
12:20UA 1537 from Philadelphia at the gate
12:15WN 4313 to Burbank leaves the gate
23 h 55 apart on the timetable, overnight
WN 4313 leaves 23 h 55 after UA 1537 arrives on the timetable: more than half a day, so not a connection we count.