AA 3739 then ET 3511 at O'Hare
Omaha → Chicago → Muscat
Timetable, Chicago time
14:12AA 3739 from Omaha at the gate
09:05ET 3511 to Muscat leaves the gate
18 h 53 apart on the timetable, overnight
ET 3511 leaves 18 h 53 after AA 3739 arrives on the timetable: more than half a day, so not a connection we count.