Paving an additional runway on an airport that does not qualify for a second runway under Sec. 151.79 is eligible if the Administrator, upon consideration on a case-to-case basis, is satisfied that--
(a) The volume of traffic justifies an additional paved runway and the layout and orientation of the additional runway will expedite traffic; or
(b) A combination of traffic volume and aircraft noise problems justifies an additional paved runway for that airport. [Amdt. 151-17, 31 FR 16525, Dec. 28, 1966]