AA 4928 then DL 2570 at O'Hare
Des Moines → Chicago → Boston
Timetable, Chicago time
11:10AA 4928 from Des Moines 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 4928 arrives on the timetable: more than half a day, so not a connection we count.