In areas which lack appropriate bodies of water so that harbor improvements cannot be established, port districts are hereby authorized to be established under the laws of the state, for the purposes for which port districts may be established under RCW 53.04.010, and such port districts shall have all of the powers, privileges and immunities conferred upon all other port districts under the laws of this state, including the same powers and rights relating to municipal airports that other port districts now have or hereafter may be granted.