(a) For the time during which a helicopter is on the heliport following the preceding landing of such helicopter and prior to its next succeeding take-off:
(1) Free time. For the initial 30 minutes period as provided in section 1280.1 hereof No charge.
(2) Additional time. For each helicopter remaining on the heliport in excess of the free time permitted under this section, and provided prior arrangement for helicopter parking is made with the Port Authority or its authorized representative, the following helicopter parking rates will be charged:
(i) For the first hour or fraction thereof $3
(ii) For each additional hour or fraction thereof (except as hereinafter provided) $2
(iii) For each hour or fraction thereof that a helicopter remains parked on the heliport in excess of four hours, unless by prior arrangement, such parking was for a greater period of time, and, in that event, for each hour or fraction thereof in excess of such agreed period of time $10
(b) Maximum parking time permitted shall be dependent on space available andthe discretion of the Port Authority or its authorized representative.