AA 3239 then ET 3511 at O'Hare
Pittsburgh → Chicago → Muscat
Timetable, Chicago time
16:54AA 3239 from Pittsburgh at the gate
09:05ET 3511 to Muscat leaves the gate
16 h 11 apart on the timetable, overnight
ET 3511 leaves 16 h 11 after AA 3239 arrives on the timetable: more than half a day, so not a connection we count.