DL 1680 then DL 549 at Atlanta
Cincinnati → Atlanta → Las Vegas
Timetable, Atlanta time
21:43DL 1680 from Cincinnati at the gate
13:00DL 549 to Las Vegas leaves the gate
15 h 17 apart on the timetable, overnight
DL 549 leaves 15 h 17 after DL 1680 arrives on the timetable: more than half a day, so not a connection we count.