An airport is very simple to build if you ignore regulations (laws keep getting worst too because they mostly only add them and rarely subtract them... Soon it will be like building a nuclear reactor).
As an example, I’ve seen people complain about building codes and why they can’t they do what they want with their property. But they don’t consider that fire services, for example, need to be able to rely on those codes.
a) the airport is far from any other humans b) the horde of humans your airport angers do not also ignore regulations OR your airport has its own sufficiently large private army