AA 1618 then ET 3511 at O'Hare
Dallas-Fort Worth → Chicago → Muscat
Timetable, Chicago time
15:19AA 1618 from Dallas-Fort Worth at the gate
09:05ET 3511 to Muscat leaves the gate
17 h 46 apart on the timetable, overnight
ET 3511 leaves 17 h 46 after AA 1618 arrives on the timetable: more than half a day, so not a connection we count.