UA 3532 then AA 3490 at O'Hare
Knoxville → Chicago → Grand Rapids
Timetable, Chicago time
18:43UA 3532 from Knoxville at the gate
13:40AA 3490 to Grand Rapids leaves the gate
18 h 57 apart on the timetable, overnight
AA 3490 leaves 18 h 57 after UA 3532 arrives on the timetable: more than half a day, so not a connection we count.