UA 3532 then AA 3980 at O'Hare
Knoxville → Chicago → Champaign
Timetable, Chicago time
18:43UA 3532 from Knoxville at the gate
13:49AA 3980 to Champaign leaves the gate
19 h 06 apart on the timetable, overnight
AA 3980 leaves 19 h 06 after UA 3532 arrives on the timetable: more than half a day, so not a connection we count.