(1)This section applies in the case of a person whose agreement for carriage is evidenced by a ticket.
(2)Where—
(a)at the time the ticket is issued or, if it is altered, at the time it is last altered, he would not (assuming there is no change of circumstances) be a chargeable passenger in relation to any flight in the course of his journey, and
(b)by reason only of a change of circumstances not attributable to any act or default of his, he arrives at or departs from an airport in the course of that journey on a flight the prescribed particulars of which were not shown on his ticket at that time,
he shall not by reason of the change of circumstances be treated as a chargeable passenger in relation to that flight.
(3)Where—
(a)at the time the ticket is issued or, if it is altered, at the time it is last altered, he would (assuming there is no change of circumstances) be a chargeable passenger in relation to one or more flights (“the proposed chargeable flights”) in the course of his journey,
(b)by reason only of a change of circumstances not attributable to any act or default of his, he arrives at or departs from an airport in the course of that journey on a flight the prescribed particulars of which were not shown on his ticket at that time, and
(c)but for this subsection he would by reason of the change be a chargeable passenger in relation to a number of flights exceeding the number of the proposed chargeable flights,
he shall not by reason of the change of circumstances be treated as a chargeable passenger in relation to that flight.