UA 3532 then AA 9912 at O'Hare
Rochester (ROC) → Chicago → Richmond
Timetable, Chicago time
11:59UA 3532 from Rochester (ROC) at the gate
07:30AA 9912 to Richmond leaves the gate
19 h 31 apart on the timetable, overnight
AA 9912 leaves 19 h 31 after UA 3532 arrives on the timetable: more than half a day, so not a connection we count.