DL 854 then DL 519 at Atlanta
Springfield → Atlanta → Denver
Timetable, Atlanta time
18:14DL 854 from Springfield at the gate
17:09DL 519 to Denver leaves the gate
22 h 55 apart on the timetable, overnight
DL 519 leaves 22 h 55 after DL 854 arrives on the timetable: more than half a day, so not a connection we count.