Sec. 1503.152. PLEDGE OF INCOME. A municipality may pledge the income from its airport and anything the municipality acquires relating to the airport to secure the payment of money to: (1) purchase the airport; or (2) construct, improve, enlarge, extend, or repair a permanent improvement, including a building, repair shop, or other structure. Added by Acts 1999, 76th Leg., ch. 227, Sec. 1, eff. Sept. 1, 1999.