Ok then you need to unzip the YPJT and place the folder in the community folder. Each additional Folder (asset pack) needed by the airport goes alongside the airport also in the community folder - but NOT inside the airport, always alongside.
Also make sure that the unzipped folder does not contain an additional folder level. When unzipped the folder contents need to be some scenery folders and the layout.json + manifest.json file - if this is the case the folder can go straight into the community folder (same is true for the additional asset packs)