UA 2840 then AA 9912 at O'Hare
Newark → Chicago → Richmond
Timetable, Chicago time
13:54UA 2840 from Newark at the gate
07:30AA 9912 to Richmond leaves the gate
17 h 36 apart on the timetable, overnight
AA 9912 leaves 17 h 36 after UA 2840 arrives on the timetable: more than half a day, so not a connection we count.