Wash. Rev. Code § 47.68.010
It is hereby declared that the purpose of this chapter is to further the public interest and aeronautical progress by providing for the protection and promotion of safety in aeronautics; by cooperating in effecting uniformity of the laws and regulations relating to the development and regulation of aeronautics in the several states consistent with federal aeronautics laws and regulations; by granting to a state agency such powers and imposing upon it such duties that the state may properly perform its functions relative to aeronautics and effectively exercise its jurisdiction over persons and property within such jurisdiction, assist in the development of a statewide system of airports, cooperate with and assist the municipalities of this state and others engaged in aeronautics, and encourage and develop aeronautics; by establishing only such regulations as are essential in order that persons engaged in aeronautics of every character may so engage with the least possible restriction, consistent with the safety and the rights of others; and by providing for cooperation with the federal authorities in the development of a national system of civil aviation and for coordination of the aeronautical activities of those authorities and the authorities of this state.
RCW 47.68.010