UA 3532 then OO 9910 at O'Hare
Knoxville → Chicago → Waterloo
Timetable, Chicago time
18:43UA 3532 from Knoxville at the gate
17:00OO 9910 to Waterloo leaves the gate
22 h 17 apart on the timetable, overnight
OO 9910 leaves 22 h 17 after UA 3532 arrives on the timetable: more than half a day, so not a connection we count.