(1) In addition to fees chargeable under regulation 3 an extension fee equivalent to 50% of the landing fee shall be paid by an aircraft operator for any extension not exceeding one hour to the operating hours of an aerodrome.
(2) Where the extension exceeds one hour, the extension fee shall be equivalent to the landing fee for the aircraft.
(3) In no case shall the extension fee be less than $300.
(4) The operating hours for George F. L. Charles and Hewanorra Airports for the purposes of calculating the extension fee shall be 6:00 a.m. to 11:00 p.m. daily.