OO 225 then DL 3902 at O'Hare
Richmond → Chicago → Detroit
Timetable, Chicago time
11:48OO 225 from Richmond at the gate
11:19DL 3902 to Detroit leaves the gate
23 h 31 apart on the timetable, overnight
DL 3902 leaves 23 h 31 after OO 225 arrives on the timetable: more than half a day, so not a connection we count.