AA 3852 then UA 3916 at O'Hare
Chattanooga → Chicago → New Orleans
Timetable, Chicago time
11:10AA 3852 from Chattanooga at the gate
07:00UA 3916 to New Orleans leaves the gate
19 h 50 apart on the timetable, overnight
UA 3916 leaves 19 h 50 after AA 3852 arrives on the timetable: more than half a day, so not a connection we count.