AA 818 then OO 9912 at O'Hare
Charlotte → Chicago → Richmond
Timetable, Chicago time
12:19AA 818 from Charlotte at the gate
07:30OO 9912 to Richmond leaves the gate
19 h 11 apart on the timetable, overnight
OO 9912 leaves 19 h 11 after AA 818 arrives on the timetable: more than half a day, so not a connection we count.