AA 595 then DL 2570 at O'Hare
Philadelphia → Chicago → Boston
Timetable, Chicago time
11:04AA 595 from Philadelphia at the gate
10:35DL 2570 to Boston leaves the gate
23 h 31 apart on the timetable, overnight
DL 2570 leaves 23 h 31 after AA 595 arrives on the timetable: more than half a day, so not a connection we count.