AA 440 then ET 3511 at O'Hare
Houston → Chicago → Muscat
Timetable, Chicago time
14:29AA 440 from Houston at the gate
09:05ET 3511 to Muscat leaves the gate
18 h 36 apart on the timetable, overnight
ET 3511 leaves 18 h 36 after AA 440 arrives on the timetable: more than half a day, so not a connection we count.