N.H. Rev. Stat. Ann. § 422:18

There shall be no exclusive right for the use of any airport or air navigation facility upon which state or federal funds have been expended; provided, that the state or a municipality acquiring air navigation facilities under the provisions of this chapter, is authorized to contract for or lease to any person the use of the facilities, prescribing the same minimum standards for all operators, and may establish reasonable rent or fees therefor. Such a contractual or lease agreement shall be adequate in its terms as to duration so as to assure permanence and stability to an operator in the use of the airport for any aeronautical business or operation up to the capacity of the airport with respect to air safety.