DL 854 then DL 2780 at Atlanta
Springfield → Atlanta → Dallas
Timetable, Atlanta time
18:51DL 854 from Springfield at the gate
16:46DL 2780 to Dallas leaves the gate
21 h 55 apart on the timetable, overnight
DL 2780 leaves 21 h 55 after DL 854 arrives on the timetable: more than half a day, so not a connection we count.