Cal. Gov. Code § 26400.51

The board of supervisors may issue bonds pursuant to this chapter for the purpose of financing the acquisition, construction, maintenance, operation, improvement, and development of property, real and personal, including, but not limited to, buildings, grounds, facilities, utilities, and structures necessary or convenient for the promotion or accommodation of air commerce and air navigation. These improvements, together with any existing or future airport facilities of the county, as the board of supervisors may determine, may be designated as a project for purposes of this chapter, and in that event Section 26400.4 does not apply to the issuance of bonds under this chapter.