AA 3503 then ET 3511 at O'Hare
Northwest Arkansas → Chicago → Muscat
Timetable, Chicago time
20:00AA 3503 from Northwest Arkansas at the gate
09:05ET 3511 to Muscat leaves the gate
13 h 05 apart on the timetable, overnight
ET 3511 leaves 13 h 05 after AA 3503 arrives on the timetable: more than half a day, so not a connection we count.