AA 4928 then ET 3511 at O'Hare
Des Moines → Chicago → Muscat
Timetable, Chicago time
11:10AA 4928 from Des Moines at the gate
09:05ET 3511 to Muscat leaves the gate
21 h 55 apart on the timetable, overnight
ET 3511 leaves 21 h 55 after AA 4928 arrives on the timetable: more than half a day, so not a connection we count.