UA 3910 then AA 9912 at O'Hare
Newark → Chicago → Richmond
Timetable, Chicago time
13:47UA 3910 from Newark at the gate
07:30AA 9912 to Richmond leaves the gate
17 h 43 apart on the timetable, overnight
AA 9912 leaves 17 h 43 after UA 3910 arrives on the timetable: more than half a day, so not a connection we count.