AA 4400 then ET 3511 at O'Hare
Memphis → Chicago → Muscat
Timetable, Chicago time
16:25AA 4400 from Memphis at the gate
09:05ET 3511 to Muscat leaves the gate
16 h 40 apart on the timetable, overnight
ET 3511 leaves 16 h 40 after AA 4400 arrives on the timetable: more than half a day, so not a connection we count.