AA 3549 then ET 3511 at O'Hare
Fort Wayne → Chicago → Muscat
Timetable, Chicago time
11:54AA 3549 from Fort Wayne at the gate
09:05ET 3511 to Muscat leaves the gate
21 h 11 apart on the timetable, overnight
ET 3511 leaves 21 h 11 after AA 3549 arrives on the timetable: more than half a day, so not a connection we count.