AA 6263 then UA 1568 at O'Hare
Flint → Chicago → Rochester (ROC)
Timetable, Chicago time
06:30AA 6263 from Flint at the gate
18:59UA 1568 to Rochester (ROC) leaves the gate
12 h 29 apart on the timetable
UA 1568 leaves 12 h 29 after AA 6263 arrives on the timetable: more than half a day, so not a connection we count.