OO 225 then AA 3974 at O'Hare
Richmond → Chicago → Harrisburg
Timetable, Chicago time
11:48OO 225 from Richmond at the gate
10:35AA 3974 to Harrisburg leaves the gate
22 h 47 apart on the timetable, overnight
AA 3974 leaves 22 h 47 after OO 225 arrives on the timetable: more than half a day, so not a connection we count.