AA 764 then OO 9912 at O'Hare
Houston → Chicago → Richmond
Timetable, Chicago time
11:58AA 764 from Houston at the gate
07:30OO 9912 to Richmond leaves the gate
19 h 32 apart on the timetable, overnight
OO 9912 leaves 19 h 32 after AA 764 arrives on the timetable: more than half a day, so not a connection we count.