DL 3122 then DL 825 at Atlanta
Pittsburgh → Atlanta → Las Vegas
Timetable, Atlanta time
22:00DL 3122 from Pittsburgh at the gate
21:15DL 825 to Las Vegas leaves the gate
23 h 15 apart on the timetable, overnight
DL 825 leaves 23 h 15 after DL 3122 arrives on the timetable: more than half a day, so not a connection we count.