UA 762 then AA 9912 at O'Hare
Burlington (BTV) → Chicago → Richmond
Timetable, Chicago time
10:45UA 762 from Burlington (BTV) at the gate
07:30AA 9912 to Richmond leaves the gate
20 h 45 apart on the timetable, overnight
AA 9912 leaves 20 h 45 after UA 762 arrives on the timetable: more than half a day, so not a connection we count.