UA 3872 then AA 529 at O'Hare
Pensacola → Chicago → Knoxville
Timetable, Chicago time
14:43UA 3872 from Pensacola at the gate
10:36AA 529 to Knoxville leaves the gate
19 h 53 apart on the timetable, overnight
AA 529 leaves 19 h 53 after UA 3872 arrives on the timetable: more than half a day, so not a connection we count.