alt Hacker NewsI'm not sure that immigration policy is relevant to libertarianism because a nation in some sense is like private property. So one could argue that the people of a country have a collective right to restrict who enters their borders. Transversing a nation's airspace would be a different story. I think if a nation blocked other nations from using its airspace for transversal it would be a violation of other people's rights, by abusing, essentially, private property exclusivity.
That's just a way to rationalize policies that are obviously anti-liberty. Is the Texas/Mexico border my property? Really? All of it? And isn't abuse of private property anti-liberty anyway? You literally just said it is.
Countries do prevent other countries from using their airspace, by the way.