Maintenance Providers Build

I don't know if this is how it works at real airports, but... one thing that could be made a bit more in depth is maintenance. Right now, you can hire maintenance companies, choose depending on three factors of each company.

Maybe one way to make it a bit more in depth and add another factor for company's to consider is to add a maintenance hangar to the pax/cargo terminals that can be 'constructed' at airports. When an aircraft goes into a maintenance at a specific airport, if a company has a slot at a maintenance hangar, its maintenance ratio could be increased.

It probably is rather complicated to put into effect, but could add another facet to the game to make it even more in-depth.