DL 390 then DL 549 at Atlanta
Los Angeles → Atlanta → Las Vegas
Timetable, Atlanta time
13:14DL 390 from Los Angeles at the gate
13:00DL 549 to Las Vegas leaves the gate
23 h 46 apart on the timetable, overnight
DL 549 leaves 23 h 46 after DL 390 arrives on the timetable: more than half a day, so not a connection we count.