AA 2500 then ET 3511 at O'Hare
Nashville → Chicago → Muscat
Timetable, Chicago time
17:25AA 2500 from Nashville at the gate
09:05ET 3511 to Muscat leaves the gate
15 h 40 apart on the timetable, overnight
ET 3511 leaves 15 h 40 after AA 2500 arrives on the timetable: more than half a day, so not a connection we count.