OO 9909 then AA 3890 at O'Hare
Waterloo → Chicago → Sioux Falls
Timetable, Chicago time
16:47OO 9909 from Waterloo at the gate
12:26AA 3890 to Sioux Falls leaves the gate
19 h 39 apart on the timetable, overnight
AA 3890 leaves 19 h 39 after OO 9909 arrives on the timetable: more than half a day, so not a connection we count.