DL 854 then DL 711 at Atlanta
Springfield → Atlanta → Las Vegas
Timetable, Atlanta time
18:14DL 854 from Springfield at the gate
17:15DL 711 to Las Vegas leaves the gate
23 h 01 apart on the timetable, overnight
DL 711 leaves 23 h 01 after DL 854 arrives on the timetable: more than half a day, so not a connection we count.