Pub. L. 91-168, tit. III, sec. 308

Sec. 308. None of the money appropriated hereby shall be used to make any payment on any lease purchase contract for jet airplanes to be used by the Federal Aviation Administration wherein the total cost of the lease payments plus the amount needed to exercise the purchase option exceeds the purchase price of the aircraft (which would have been charged were the aircraft to be purchased by normal appropriations) by more than 20 per centum.