In a post on their Facebook page, developer FSimStudios has posted an update outlining their continued work on Cancun International Airport for P3Dv4
At the moment they are completing the last couple of items that need to be done on the scenery before release, such as ground polygons, placing objects around the airport and SODE jetways. Included with the airport are over 100 buildings including the fully modeled hotel area but the developer stated that the textures still do need to be placed on most of the objects.
There has been no release date provided so far by the team, but they hope to have it completed by Q1 of 2019.