AA 6283 then ET 3511 at O'Hare
Des Moines → Chicago → Muscat
Timetable, Chicago time
15:44AA 6283 from Des Moines at the gate
09:05ET 3511 to Muscat leaves the gate
17 h 21 apart on the timetable, overnight
ET 3511 leaves 17 h 21 after AA 6283 arrives on the timetable: more than half a day, so not a connection we count.