Okla. Stat. tit. 3, § 3-106: Airport zoning requirements

(1) Reasonableness. All airport zoning regulations adopted

under this act shall be reasonable and none shall impose any

requirement or restriction which is not reasonably necessary to

effectuate the purposes of this act. In determining what

regulations it may adopt, each political subdivision and Joint

Airport Zoning Board shall consider, among other things, the

character of the flying operations expected to be conducted at the

airport, the nature of the terrain within the airport hazard area,

the character of the neighborhood, and the uses to which the

property to be zoned is put and adaptable.

(2) Nonconforming Uses. No airport zoning regulations adopted

under this act shall require the removal, lowering, or other change

or alteration of any structure or tree not conforming to the

regulations when adopted or amended, or otherwise interfere with the

continuance of any nonconforming use, except as provided in Section

7(3).