ET 574 then UA 3636 at O'Hare
Rome → Chicago → Knoxville
Timetable, Chicago time
07:40ET 574 from Rome at the gate
07:07UA 3636 to Knoxville leaves the gate
23 h 27 apart on the timetable, overnight
UA 3636 leaves 23 h 27 after ET 574 arrives on the timetable: more than half a day, so not a connection we count.