AA 3811 then ET 3511 at O'Hare
Omaha → Chicago → Muscat
Timetable, Chicago time
17:57AA 3811 from Omaha at the gate
09:05ET 3511 to Muscat leaves the gate
15 h 08 apart on the timetable, overnight
ET 3511 leaves 15 h 08 after AA 3811 arrives on the timetable: more than half a day, so not a connection we count.