AA 540 then DL 2570 at O'Hare
Nashville → Chicago → Boston
Timetable, Chicago time
11:05AA 540 from Nashville at the gate
10:35DL 2570 to Boston leaves the gate
23 h 30 apart on the timetable, overnight
DL 2570 leaves 23 h 30 after AA 540 arrives on the timetable: more than half a day, so not a connection we count.