5. Fares for travel by air shall be payable if either—
(a)the rate for travel by air does not exceed the rate applicable to travel by appropriate alternative means of transport together with an allowance equivalent to the amount of any saving in subsistence expenses consequent on travel by air; or
(b)the council resolves, either generally or specially, that the saving in time is so substantial as to justify payment of the fare for travel by air, in which case there may be paid an amount not exceeding—
(i)the ordinary or any available cheap fare for travel by regular air service; or
(ii)where no such service is available, or in any case of urgency, the fare actually paid by the councillor or committee member.