UA 1575 then OO 9912 at O'Hare
Savannah → Chicago → Richmond
Timetable, Chicago time
10:41UA 1575 from Savannah at the gate
07:30OO 9912 to Richmond leaves the gate
20 h 49 apart on the timetable, overnight
OO 9912 leaves 20 h 49 after UA 1575 arrives on the timetable: more than half a day, so not a connection we count.