UA 3532 then AA 2680 at O'Hare
Knoxville → Chicago → Washington National
Timetable, Chicago time
18:43UA 3532 from Knoxville at the gate
14:52AA 2680 to Washington National leaves the gate
20 h 09 apart on the timetable, overnight
AA 2680 leaves 20 h 09 after UA 3532 arrives on the timetable: more than half a day, so not a connection we count.