AA 873 then OO 9912 at O'Hare
Atlanta → Chicago → Richmond
Timetable, Chicago time
12:29AA 873 from Atlanta at the gate
07:30OO 9912 to Richmond leaves the gate
19 h 01 apart on the timetable, overnight
OO 9912 leaves 19 h 01 after AA 873 arrives on the timetable: more than half a day, so not a connection we count.