AA 2720 then ET 3511 at O'Hare
Phoenix → Chicago → Muscat
Timetable, Chicago time
16:09AA 2720 from Phoenix at the gate
09:05ET 3511 to Muscat leaves the gate
16 h 56 apart on the timetable, overnight
ET 3511 leaves 16 h 56 after AA 2720 arrives on the timetable: more than half a day, so not a connection we count.