Mich. Comp. Laws § 259.130
Political subdivisions may appropriate funds and levy tax for airports, landing fields and other aeronautical facilities. Every political subdivision of this state is hereby authorized to appropriate funds for acquisition, improvement, maintenance and equipping of airports, landing fields and other aeronautical facilities as provided in this act, and may levy tax on property within such political subdivisions subject to taxation for public purposes, as provided by law; but said tax shall never exceed in any 1 year 1 mill on the assessed valuation of said political subdivision: Provided, That funds of any political subdivision not already appropriated or earmarked for other purposes may be used for the herein authorized purposes upon the majority vote of the legislative body of any such political subdivision.
MCL 259.130