AA 4507 then ET 3511 at O'Hare
Cincinnati Northern Kentucky → Chicago → Muscat
Timetable, Chicago time
14:36AA 4507 from Cincinnati Northern Kentucky at the gate
09:05ET 3511 to Muscat leaves the gate
18 h 29 apart on the timetable, overnight
ET 3511 leaves 18 h 29 after AA 4507 arrives on the timetable: more than half a day, so not a connection we count.