AA 6486 then UA 1239 at O'Hare
Detroit → Chicago → Rochester (ROC)
Timetable, Chicago time
17:29AA 6486 from Detroit at the gate
13:55UA 1239 to Rochester (ROC) leaves the gate
20 h 26 apart on the timetable, overnight
UA 1239 leaves 20 h 26 after AA 6486 arrives on the timetable: more than half a day, so not a connection we count.