California Code, Government Code - GOV § 50485.6

Prior to the initial zoning of any airport hazard area under this article, the city or county which is to adopt the regulations shall appoint a commission, to be known as the airport zoning commission, to recommend the boundaries of the various zones to be established and the regulations to be adopted therefor.  Such commission shall make a preliminary report and hold public hearings thereon before submitting its final report, and the legislative body of the city or county shall not hold its public hearings or take other action until it has received the final report of such commission.  Where a city or county planning commission already exists, it shall be appointed as the airport zoning commission.