AA 3740 then CV 251 at O'Hare
Sioux Falls → Chicago → Dallas-Fort Worth
Timetable, Chicago time
09:00AA 3740 from Sioux Falls at the gate
22:10CV 251 to Dallas-Fort Worth leaves the gate
13 h 10 apart on the timetable
CV 251 leaves 13 h 10 after AA 3740 arrives on the timetable: more than half a day, so not a connection we count.