UA 719 then AA 529 at O'Hare
Philadelphia → Chicago → Knoxville
Timetable, Chicago time
14:50UA 719 from Philadelphia at the gate
10:36AA 529 to Knoxville leaves the gate
19 h 46 apart on the timetable, overnight
AA 529 leaves 19 h 46 after UA 719 arrives on the timetable: more than half a day, so not a connection we count.