UA 3532 then UA 752 at O'Hare
Knoxville → Chicago → Washington National
Timetable, Chicago time
18:43UA 3532 from Knoxville at the gate
12:29UA 752 to Washington National leaves the gate
17 h 46 apart on the timetable, overnight
UA 752 leaves 17 h 46 after UA 3532 arrives on the timetable: more than half a day, so not a connection we count.