UA 1393 then AA 529 at O'Hare
San Francisco → Chicago → Knoxville
Timetable, Chicago time
14:49UA 1393 from San Francisco at the gate
10:36AA 529 to Knoxville leaves the gate
19 h 47 apart on the timetable, overnight
AA 529 leaves 19 h 47 after UA 1393 arrives on the timetable: more than half a day, so not a connection we count.