UA 2331 then AA 529 at O'Hare
Washington → Chicago → Knoxville
Timetable, Chicago time
14:38UA 2331 from Washington at the gate
10:36AA 529 to Knoxville leaves the gate
19 h 58 apart on the timetable, overnight
AA 529 leaves 19 h 58 after UA 2331 arrives on the timetable: more than half a day, so not a connection we count.