Wis. Stat. § 114.13: Purchase of land for airports and spaceports.

Private property needed by a county, city, village or town for an airport or landing field or landing and take-off strip, or for a spaceport or spacecraft launch or landing area, or property or rights for the protection of the aerial approaches thereof, shall be acquired by purchase if the city, village, town or county is able to agree with the owners on the terms thereof, and otherwise by condemnation, as provided in s. 32.05. The purchase price or award for real property acquired for an airport or landing field or landing and take-off strip, or for a spaceport or spacecraft launch or landing area, or property or rights for the protection of the aerial approaches thereof, may be paid for the appropriation of moneys available therefor, or wholly or partly from the proceeds of the sale of bonds of the city, village, town or county, as the governing body of such city, village, town or county determines, subject to ch. 67. Such property or rights may be acquired by gift, which the respective governing bodies are authorized to accept.