the explanatory statement described in section 4 (in the matter preceding division A of this consolidated Act): Provided further, That not to exceed 10 percent of any funding level specified under this heading in the explanatory statement described in section 4 (in the matter preceding division A of this consolidated Act) may be transferred to any other funding level specified under this heading in the explanatory statement described in section 4 (in the matter preceding division A of this consolidated Act): Provided further, That no transfer may increase or decrease any funding level by more than 10 percent: Provided further, That any transfer in excess of 10 percent shall be treated as a reprogramming of funds under section 405 of this Act and shall not be available for obligation or expenditure except in compliance with the procedures set forth in that section. GRANTS-IN-AID FOR AIRPORTS (LIQUIDATION OF CONTRACT AUTHORIZATION) (LIMITATION ON OBLIGATIONS) (AIRPORT AND AIRWAY TRUST FUND) (INCLUDING TRANSFER OF FUNDS) For liquidation of obligations incurred for grants-in-aid for airport planning and development, and noise compatibility planning and programs as authorized under subchapter I of chapter 471 and subchapter I of chapter 475 of title 49, United States Code, and under other law authorizing such obligations