AA 2221 then ET 3511 at O'Hare
Charleston (South Carolina) → Chicago → Muscat
Timetable, Chicago time
18:01AA 2221 from Charleston (South Carolina) at the gate
09:05ET 3511 to Muscat leaves the gate
15 h 04 apart on the timetable, overnight
ET 3511 leaves 15 h 04 after AA 2221 arrives on the timetable: more than half a day, so not a connection we count.