AA 4170 then ET 3511 at O'Hare
Oklahoma City → Chicago → Muscat
Timetable, Chicago time
15:00AA 4170 from Oklahoma City at the gate
09:05ET 3511 to Muscat leaves the gate
18 h 05 apart on the timetable, overnight
ET 3511 leaves 18 h 05 after AA 4170 arrives on the timetable: more than half a day, so not a connection we count.