Hi

What do you mean with businesses airlines?

I see you already published airline mods, so I am not sure what you want to add.

I mean these tags on the main page of the Airport workshop, e.g.
BUSINESSES,
Airline (1,011)
Aviation Fuel Supplier (12)
Deicing Fluid Supplier (7)
Catering Food Supplier (7)
Food Franchise (19)
Franchise Shop (13)
Contractor (8)
Bank (9)
SAVES
Save (1,118)
TEMPLATES
Template (32)
AIRPORT LOGOS
Logos (28)
SHOP PRODUCTS
Product (4).
I want to add a "Airline" tag to my mod and i don't know how.

Yes, tags is the right word. :)

Those can be added to the ModData.json


I put them at the end like after the modType but before the closing }
example:

"iconFileName":"Icon.png","modType":"Businesses","tags":["Airline"]}

By the way, which program do you use for the mods?

Thank you very much! And I don't have any program to do mods, I just learned how to make mods from the WIGG11 guide.

I mean which graphic software do you use? And do you paint the PNG file or the PSD file?

I use Paint.net and I paint the PNG file

I think paint .net also works with psd.
On the psd you have layers and you could paint below the shadows and decoration.
The png is only for the final use in the mod.

From the original psd files, paint.net will have some shadow issues... But there are mdks that are better compatible with paint.net