AA 547 then ET 3511 at O'Hare
Boston → Chicago → Muscat
Timetable, Chicago time
15:29AA 547 from Boston at the gate
09:05ET 3511 to Muscat leaves the gate
17 h 36 apart on the timetable, overnight
ET 3511 leaves 17 h 36 after AA 547 arrives on the timetable: more than half a day, so not a connection we count.