AA 4649 then ET 3511 at O'Hare
Pittsburgh → Chicago → Muscat
Timetable, Chicago time
10:55AA 4649 from Pittsburgh at the gate
09:05ET 3511 to Muscat leaves the gate
22 h 10 apart on the timetable, overnight
ET 3511 leaves 22 h 10 after AA 4649 arrives on the timetable: more than half a day, so not a connection we count.