DL 609 then DL 5442 at Atlanta
Cancún → Atlanta → Allentown
Timetable, Atlanta time
10:55DL 609 from Cancún at the gate
09:58DL 5442 to Allentown leaves the gate
23 h 03 apart on the timetable, overnight
DL 5442 leaves 23 h 03 after DL 609 arrives on the timetable: more than half a day, so not a connection we count.