AA 6246 then ET 3511 at O'Hare
Nashville → Chicago → Muscat
Timetable, Chicago time
19:51AA 6246 from Nashville at the gate
09:05ET 3511 to Muscat leaves the gate
13 h 14 apart on the timetable, overnight
ET 3511 leaves 13 h 14 after AA 6246 arrives on the timetable: more than half a day, so not a connection we count.