They can if the airline does not agreed to reasonable terms. of course the definition of “reasonable” is wide enough for a A380 load of lawyers.

For argument sake, let’s compare an airport with a car dealership. If you go to the dealer to buy a new car you get a list with packages to choose from. Do you want a Polo, a Golf or a Passat? Do you want the sports package or the comfy package? Do you want normal wheels or alloys? The list is endless. After you make your choices a certain price will show. At this point the dealership will have some negotiation space. This can be done to lower the price, or to increase service for instance with extended warranty or favourable financing.

The same happens with airports. They have price lists and optional packages. The price list are the default charges like landing charges, ATC charges and taxes. A good portion of those will be mandated by various legal autorities. Next to those the airport can offer various optional “packages”. For instance for lounge access, fast turnaround, remote or terminal parking etc.

Now back to the dealership. You have choosen your car and yhe dealership has established you are financially able to buy one. At this point I don’t think the dealer has the right to refuse the deal. After all, simply by advertising the dealer (or rather the importer but let’s keep it simple) made an offer. In commercial law any reasonable* offer is binding.

*reasonable: there’s that A380 load of lawyers again