PD 2703 then DL 2570 at O'Hare
Toronto (YTZ) → Chicago → Boston
Timetable, Chicago time
11:34PD 2703 from Toronto (YTZ) at the gate
11:00DL 2570 to Boston leaves the gate
23 h 26 apart on the timetable, overnight
DL 2570 leaves 23 h 26 after PD 2703 arrives on the timetable: more than half a day, so not a connection we count.