AA 3740 then OO 9912 at O'Hare
Sioux Falls → Chicago → Richmond
Timetable, Chicago time
09:00AA 3740 from Sioux Falls at the gate
07:30OO 9912 to Richmond leaves the gate
22 h 30 apart on the timetable, overnight
OO 9912 leaves 22 h 30 after AA 3740 arrives on the timetable: more than half a day, so not a connection we count.