AC 1503 then WS 2712 at Toronto Pearson
Newark → Toronto → Cancún
Timetable, Toronto time
09:51AC 1503 from Newark at the gate
09:25WS 2712 to Cancún leaves the gate
23 h 34 apart on the timetable, overnight
WS 2712 leaves 23 h 34 after AC 1503 arrives on the timetable: more than half a day, so not a connection we count.