UA 3532 then AA 1812 at O'Hare
Knoxville → Chicago → Miami
Timetable, Chicago time
18:43UA 3532 from Knoxville at the gate
16:43AA 1812 to Miami leaves the gate
22 h apart on the timetable, overnight
AA 1812 leaves 22 h after UA 3532 arrives on the timetable: more than half a day, so not a connection we count.