F9 152 then WN 261 at Atlanta
Cancún → Atlanta → Denver
Timetable, Atlanta time
17:41F9 152 from Cancún at the gate
17:35WN 261 to Denver leaves the gate
23 h 54 apart on the timetable, overnight
WN 261 leaves 23 h 54 after F9 152 arrives on the timetable: more than half a day, so not a connection we count.