UA 1239 then AA 529 at O'Hare
San Jose (California) → Chicago → Knoxville
Timetable, Chicago time
12:54UA 1239 from San Jose (California) at the gate
10:36AA 529 to Knoxville leaves the gate
21 h 42 apart on the timetable, overnight
AA 529 leaves 21 h 42 after UA 1239 arrives on the timetable: more than half a day, so not a connection we count.