AA 4191 then UA 3907 at O'Hare
Rochester (ROC) → Chicago → Cleveland
Timetable, Chicago time
12:37AA 4191 from Rochester (ROC) at the gate
07:30UA 3907 to Cleveland leaves the gate
18 h 53 apart on the timetable, overnight
UA 3907 leaves 18 h 53 after AA 4191 arrives on the timetable: more than half a day, so not a connection we count.