AA 3484 then ET 3511 at O'Hare
St Louis → Chicago → Muscat
Timetable, Chicago time
19:05AA 3484 from St Louis at the gate
09:05ET 3511 to Muscat leaves the gate
14 h apart on the timetable, overnight
ET 3511 leaves 14 h after AA 3484 arrives on the timetable: more than half a day, so not a connection we count.