AA 3580 then OO 9912 at O'Hare
Louisville → Chicago → Richmond
Timetable, Chicago time
13:30AA 3580 from Louisville at the gate
07:30OO 9912 to Richmond leaves the gate
18 h apart on the timetable, overnight
OO 9912 leaves 18 h after AA 3580 arrives on the timetable: more than half a day, so not a connection we count.