DL 420 then AA 9912 at O'Hare
Savannah → Chicago → Richmond
Timetable, Chicago time
13:13DL 420 from Savannah at the gate
07:30AA 9912 to Richmond leaves the gate
18 h 17 apart on the timetable, overnight
AA 9912 leaves 18 h 17 after DL 420 arrives on the timetable: more than half a day, so not a connection we count.