AA 2515 then ET 3511 at O'Hare
Portland (Oregon) → Chicago → Muscat
Timetable, Chicago time
19:35AA 2515 from Portland (Oregon) at the gate
09:05ET 3511 to Muscat leaves the gate
13 h 30 apart on the timetable, overnight
ET 3511 leaves 13 h 30 after AA 2515 arrives on the timetable: more than half a day, so not a connection we count.