AA 1200 then DL 2570 at O'Hare
Washington National → Chicago → Boston
Timetable, Chicago time
11:34AA 1200 from Washington National at the gate
10:35DL 2570 to Boston leaves the gate
23 h 01 apart on the timetable, overnight
DL 2570 leaves 23 h 01 after AA 1200 arrives on the timetable: more than half a day, so not a connection we count.