Combined Airport Package System, or simply "CAPS" for Flightgear.
Combined Airport Package System is a pack of models that can be freely placed into an airport scenery. It is more prominent for FG users who use FG-Scenery SD, which has a better performance
Use an Archiever, like 7zip, to unzip the archive after download.
Then, copy/cut the model file and paste it to you FGROOT.
Now, you can use your UFO to place the models in the airport of your wish...