AA 3740 then UA 5344 at O'Hare
Sioux Falls → Chicago → Spokane
Timetable, Chicago time
09:00AA 3740 from Sioux Falls at the gate
08:40UA 5344 to Spokane leaves the gate
23 h 40 apart on the timetable, overnight
UA 5344 leaves 23 h 40 after AA 3740 arrives on the timetable: more than half a day, so not a connection we count.