AA 9950 then AA 4931 at O'Hare
Philadelphia → Chicago → Sioux Falls
Timetable, Chicago time
13:49AA 9950 from Philadelphia at the gate
09:40AA 4931 to Sioux Falls leaves the gate
19 h 51 apart on the timetable, overnight
AA 4931 leaves 19 h 51 after AA 9950 arrives on the timetable: more than half a day, so not a connection we count.