WN 3534 then DL 1939 at Atlanta
Pittsburgh → Atlanta → Cancún
Timetable, Atlanta time
18:45WN 3534 from Pittsburgh at the gate
18:29DL 1939 to Cancún leaves the gate
23 h 44 apart on the timetable, overnight
DL 1939 leaves 23 h 44 after WN 3534 arrives on the timetable: more than half a day, so not a connection we count.