AA 2439 then ET 3511 at O'Hare
Nashville → Chicago → Muscat
Timetable, Chicago time
11:00AA 2439 from Nashville at the gate
09:05ET 3511 to Muscat leaves the gate
22 h 05 apart on the timetable, overnight
ET 3511 leaves 22 h 05 after AA 2439 arrives on the timetable: more than half a day, so not a connection we count.