OO 225 then UA 2844 at O'Hare
Richmond → Chicago → St Louis
Timetable, Chicago time
11:48OO 225 from Richmond at the gate
10:45UA 2844 to St Louis leaves the gate
22 h 57 apart on the timetable, overnight
UA 2844 leaves 22 h 57 after OO 225 arrives on the timetable: more than half a day, so not a connection we count.