AC 8477 then DL 2570 at O'Hare
Montréal → Chicago → Boston
Timetable, Chicago time
11:07AC 8477 from Montréal at the gate
10:35DL 2570 to Boston leaves the gate
23 h 28 apart on the timetable, overnight
DL 2570 leaves 23 h 28 after AC 8477 arrives on the timetable: more than half a day, so not a connection we count.