AA 866 then ET 3511 at O'Hare
Boston → Chicago → Muscat
Timetable, Chicago time
15:37AA 866 from Boston at the gate
09:05ET 3511 to Muscat leaves the gate
17 h 28 apart on the timetable, overnight
ET 3511 leaves 17 h 28 after AA 866 arrives on the timetable: more than half a day, so not a connection we count.