31.—(1) This Part applies to any airport in the State open to commercial traffic and having an annual passenger throughout of in excess of one million passengers in the previous calendar year.

(2) The Minister, after consultation with the Commission, may, by regulations, vary the annual passenger throughput mentioned in subsection (1).

(3) Every regulation made by the Minister under subsection (2) shall be laid before each House of the Oireachtas as soon as may be after it is made and, if a resolution annulling the regulation is passed by either such House within the next 21 days on which that House has sat after the regulation is laid before it, the regulation shall be annulled accordingly, but without prejudice to the validity of anything previously done thereunder.