AA 3512 then UA 1568 at O'Hare
Cedar Rapids → Chicago → Rochester (ROC)
Timetable, Chicago time
06:29AA 3512 from Cedar Rapids at the gate
18:59UA 1568 to Rochester (ROC) leaves the gate
12 h 30 apart on the timetable
UA 1568 leaves 12 h 30 after AA 3512 arrives on the timetable: more than half a day, so not a connection we count.