I don't remember talking about an airport. Btw, an airport is a private business with public utility, it has some rules as every other place, I don't see where the contradiction is (even if I don't agree with some of those rules), but generally no one can prevent me from accessing it. I suppose here we are talking about private spaces where the owner can block me from accessing them; so theoretically I cannot move from a place to another because there are no accessible routes, or I cannot spend a day in nature because I don't "own" it.