WN 1801 then DL 1939 at Atlanta
Denver → Atlanta → Cancún
Timetable, Atlanta time
18:35WN 1801 from Denver at the gate
18:29DL 1939 to Cancún leaves the gate
23 h 54 apart on the timetable, overnight
DL 1939 leaves 23 h 54 after WN 1801 arrives on the timetable: more than half a day, so not a connection we count.