AA 1239 then ET 3511 at O'Hare
Boston → Chicago → Muscat
Timetable, Chicago time
10:30AA 1239 from Boston at the gate
09:05ET 3511 to Muscat leaves the gate
22 h 35 apart on the timetable, overnight
ET 3511 leaves 22 h 35 after AA 1239 arrives on the timetable: more than half a day, so not a connection we count.