AA 3852 then UA 3874 at O'Hare
Chattanooga → Chicago → LCQ
Timetable, Chicago time
11:04AA 3852 from Chattanooga at the gate
06:30UA 3874 to LCQ leaves the gate
19 h 26 apart on the timetable, overnight
UA 3874 leaves 19 h 26 after AA 3852 arrives on the timetable: more than half a day, so not a connection we count.