UA 5803 then AA 529 at O'Hare
Lexington → Chicago → Knoxville
Timetable, Chicago time
14:40UA 5803 from Lexington at the gate
10:36AA 529 to Knoxville leaves the gate
19 h 56 apart on the timetable, overnight
AA 529 leaves 19 h 56 after UA 5803 arrives on the timetable: more than half a day, so not a connection we count.