"neutal" catering and refueling companies

[HeicoH]

There are a lot of catering companies and refueling companies integrated in GSX, but on the other hand many are missing. Is it possible to choose neutal "liveries" in case at a specific airport (or specific stands of an airport) none of those in the list match the reality? 

[virtuali]

It would be way more useful if you could make a list with all missing companies, with some pointers to where they operate.

[HeicoH]

I can give you an example: at all airports aon the Canary Islands the ground services for international flights and flights to the Spanish mainland are provided by IBERIA (which is available in GSX), for regional flights the provider is BINTER (which is not available in GSX).

But this is not the core intention of my question. At many small island airports the ground services are provided by either the company that manages the airport or by respective local companies. It would be nice to have a neutal livery for those airports, as to me it seems to be neither useful for me to name all those local companies nor for you to integrate those into GSX.