UA 3532 then OO 391 at O'Hare
Knoxville → Chicago → Detroit
Timetable, Chicago time
18:43UA 3532 from Knoxville at the gate
14:30OO 391 to Detroit leaves the gatealso UA 391
19 h 47 apart on the timetable, overnight
OO 391 leaves 19 h 47 after UA 3532 arrives on the timetable: more than half a day, so not a connection we count.