DL 1247 then DL 4707 at Atlanta
Chicago O'Hare → Atlanta → Springfield
Timetable, Atlanta time
09:55DL 1247 from Chicago O'Hare at the gate
09:45DL 4707 to Springfield leaves the gate
23 h 50 apart on the timetable, overnight
DL 4707 leaves 23 h 50 after DL 1247 arrives on the timetable: more than half a day, so not a connection we count.