AA 3815 then AA 4958 at O'Hare
Hartford → Chicago → Sioux Falls
Timetable, Chicago time
20:15AA 3815 from Hartford at the gate
17:07AA 4958 to Sioux Falls leaves the gate
20 h 52 apart on the timetable, overnight
AA 4958 leaves 20 h 52 after AA 3815 arrives on the timetable: more than half a day, so not a connection we count.