Conn. Gen. Stat. § 12-74

All property owned by any town or city, which is located in another town and used for the purposes of an airport, shall be exempt from taxation as long as it continues to be used for such purposes and as long as the town in which it is located has the same privileges as to the use of such airport as are possessed by the municipality owning the same; but, if any such airport is leased to any person, association or private corporation, or is used in such manner as to become a source of profit to the municipality owning the same, the land so occupied and situated in any adjoining town or towns shall thereupon be subject to taxation.