OO 9909 then UA 3645 at O'Hare
Waterloo → Chicago → Kansas City
Timetable, Chicago time
16:47OO 9909 from Waterloo at the gate
12:40UA 3645 to Kansas City leaves the gate
19 h 53 apart on the timetable, overnight
UA 3645 leaves 19 h 53 after OO 9909 arrives on the timetable: more than half a day, so not a connection we count.