UA 3532 then AA 3484 at O'Hare
Knoxville → Chicago → St Louis
Timetable, Chicago time
18:43UA 3532 from Knoxville at the gate
09:30AA 3484 to St Louis leaves the gate
14 h 47 apart on the timetable, overnight
AA 3484 leaves 14 h 47 after UA 3532 arrives on the timetable: more than half a day, so not a connection we count.