UA 3375 then AA 9912 at O'Hare
Richmond → Chicago → Richmond
Timetable, Chicago time
09:45UA 3375 from Richmond at the gate
07:30AA 9912 to Richmond leaves the gate
21 h 45 apart on the timetable, overnight
AA 9912 leaves 21 h 45 after UA 3375 arrives on the timetable: more than half a day, so not a connection we count.