AA 6349 then DL 2570 at O'Hare
Kansas City → Chicago → Boston
Timetable, Chicago time
11:10AA 6349 from Kansas City at the gate
11:00DL 2570 to Boston leaves the gate
23 h 50 apart on the timetable, overnight
DL 2570 leaves 23 h 50 after AA 6349 arrives on the timetable: more than half a day, so not a connection we count.