UA 3532 then AA 3731 at O'Hare
Knoxville → Chicago → Greenville-Spartanburg
Timetable, Chicago time
18:43UA 3532 from Knoxville at the gate
13:10AA 3731 to Greenville-Spartanburg leaves the gate
18 h 27 apart on the timetable, overnight
AA 3731 leaves 18 h 27 after UA 3532 arrives on the timetable: more than half a day, so not a connection we count.