70 ILCS 5/8.02
To acquire, within or without the corporate limits of the Authority, land in fee simple, including township roadways, rights in and over land or water, and easements upon, over or across land or water, and leasehold interests in land or water, and tangible and intangible personal property, used or useful for the location, establishment, maintenance, development, expansion, extension or improvement of any such public airport or public airport facility. Such acquisition may be by dedication, purchase, gift, agreement, lease, use or adverse possession or by condemnation. The authority may acquire for such purposes land in fee simple subject to a mortgage and as part of the purchase price may assume the payment of the indebtedness secured by the mortgage. Land may be acquired, possessed and used for such purposes by an authority under a written contract for a deed thereto conveying merchantable title and providing that the deed shall be placed in escrow and be delivered upon payment of the purchase price and containing such other terms as are reasonably incident to such a contract. Personal property may be purchased on an installment contract basis.
70 ILCS 5/8.02