UA 1252 then AA 529 at O'Hare
Washington → Chicago → Knoxville
Timetable, Chicago time
11:38UA 1252 from Washington at the gate
10:36AA 529 to Knoxville leaves the gate
22 h 58 apart on the timetable, overnight
AA 529 leaves 22 h 58 after UA 1252 arrives on the timetable: more than half a day, so not a connection we count.