AA 3852 then ET 3511 at O'Hare
Chattanooga → Chicago → Muscat
Timetable, Chicago time
11:10AA 3852 from Chattanooga at the gate
09:05ET 3511 to Muscat leaves the gate
21 h 55 apart on the timetable, overnight
ET 3511 leaves 21 h 55 after AA 3852 arrives on the timetable: more than half a day, so not a connection we count.