They'd be shooting themselves in the foot there because I believe Mexican passengers flying MEX-DXB/MEX-DXB-XXX would require an American visa if the aircraft touches down on American soil
Silly, I know. It has a huge turnaround in FLL so tagging on to MEX wouldn't be too difficult, if it didn't preclude the majority of passengers from using the service
I think they should look at tagging it with HAV/CUN/SJU etc. I think Cancun makes the most sense