AA 6438 then UA 3378 at O'Hare
Marion → Chicago → Richmond
Timetable, Chicago time
12:24AA 6438 from Marion at the gate
08:30UA 3378 to Richmond leaves the gate
20 h 06 apart on the timetable, overnight
UA 3378 leaves 20 h 06 after AA 6438 arrives on the timetable: more than half a day, so not a connection we count.