DL 609 then DL 1345 at Atlanta
Cancún → Atlanta → Pittsburgh
Timetable, Atlanta time
10:55DL 609 from Cancún at the gate
10:53DL 1345 to Pittsburgh leaves the gate
23 h 58 apart on the timetable, overnight
DL 1345 leaves 23 h 58 after DL 609 arrives on the timetable: more than half a day, so not a connection we count.