N.H. Rev. Stat. Ann. § 423:1

Towns are authorized and empowered to construct, own, manage, or provide by contract or otherwise for the management of aircraft landing areas, either within or beyond the boundaries of the town, and for that purpose any town may take land in fee by gift or purchase, or by right of eminent domain as hereinafter provided, or may lease the same, and may erect thereon and maintain such buildings or other structures as may be necessary more fully to carry out the purpose hereof. Two or more towns may join in such action.