The following regulations set out in this chapter shall apply in the A-D airport district, which zone is established to provide an area for the exclusive use of airports and related facilities. No building or structure of any type shall be used, erected, structurally altered, enlarged or maintained, and no land shall be used in the airport district, except for the uses and in accordance with the height and area requirements and other regulations hereinafter provided. The regulations and limitations provided herein do not supersede or replace any regulations or limitations governing airports or airfields which have been enacted by state or federal agencies, but are in addition to any such regulations and limitations. (Ord. 1000 § 31.50, 1955)