Chapter 17.45 AA (AIRPORT APPROACH) ZONE This chapter is included in your selections. Sections: 17.45.010 Generally. 17.45.011 Legislative authority. 17.45.012 Definitions. 17.45.020 Types of zones and height limits. 17.45.030 Airport approach zoning map. 17.45.040 Enforcement. 17.45.050 Permits.