UA 5912 then AA 529 at O'Hare
Lincoln → Chicago → Knoxville
Timetable, Chicago time
12:55UA 5912 from Lincoln at the gate
10:36AA 529 to Knoxville leaves the gate
21 h 41 apart on the timetable, overnight
AA 529 leaves 21 h 41 after UA 5912 arrives on the timetable: more than half a day, so not a connection we count.