Hello ftrebien,
inside the local context that you refers, tertiary is the higher classification you can use. Even these tertiaries can be unclassified. Here "Villa Las Estrellas" is the unique relevant settlement. The nearby bases have little or zero permanent population. A reasonable solution can be using tertiary to join aerodrome with Villa Las Estrellas and using unclassified to connect Villa Las Estrellas with the bases that depending of the village.
Regards.