Okla. Stat. tit. 3, § 3-88: Provisions not mandatory

No provision of this act is mandatory upon any city or town in

Oklahoma, or the governing body thereof, in the acquisition,

improvement, construction, operation, or maintenance of any

municipally owned airport or air navigation facility; nor shall any

provision of this act prevent or take away from any city or town

governing board the authority to deal directly with any agency of

the federal government in the matching of any funds made available

by the federal government for acquisition, improvement,

construction, operation, or maintenance of any such municipally

owned airport or air navigation facility.