UA 1248 then AA 529 at O'Hare
San Francisco → Chicago → Knoxville
Timetable, Chicago time
11:24UA 1248 from San Francisco at the gate
10:36AA 529 to Knoxville leaves the gate
23 h 12 apart on the timetable, overnight
AA 529 leaves 23 h 12 after UA 1248 arrives on the timetable: more than half a day, so not a connection we count.