AA 3852 then DL 2570 at O'Hare
Chattanooga → Chicago → Boston
Timetable, Chicago time
11:10AA 3852 from Chattanooga at the gate
10:35DL 2570 to Boston leaves the gate
23 h 25 apart on the timetable, overnight
DL 2570 leaves 23 h 25 after AA 3852 arrives on the timetable: more than half a day, so not a connection we count.