OO 391 then DL 4989 at Detroit
Chicago O'Hare → Detroit → Knoxville
Timetable, Detroit time
16:53OO 391 from Chicago O'Hare at the gate
16:44DL 4989 to Knoxville leaves the gate
23 h 51 apart on the timetable, overnight
DL 4989 leaves 23 h 51 after OO 391 arrives on the timetable: more than half a day, so not a connection we count.