AA 6423 then UA 4606 at O'Hare
Lincoln → Chicago → Richmond
Timetable, Chicago time
07:58AA 6423 from Lincoln at the gate
07:30UA 4606 to Richmond leaves the gate
23 h 32 apart on the timetable, overnight
UA 4606 leaves 23 h 32 after AA 6423 arrives on the timetable: more than half a day, so not a connection we count.