AA 2489 then OO 9912 at O'Hare
Baltimore → Chicago → Richmond
Timetable, Chicago time
08:45AA 2489 from Baltimore at the gate
07:30OO 9912 to Richmond leaves the gate
22 h 45 apart on the timetable, overnight
OO 9912 leaves 22 h 45 after AA 2489 arrives on the timetable: more than half a day, so not a connection we count.