DL 1237 then F9 1441 at Atlanta
Sioux Falls → Atlanta → Chicago O'Hare
Timetable, Atlanta time
09:00DL 1237 from Sioux Falls at the gate
07:44F9 1441 to Chicago O'Hare leaves the gate
22 h 44 apart on the timetable, overnight
F9 1441 leaves 22 h 44 after DL 1237 arrives on the timetable: more than half a day, so not a connection we count.