A única maneira de ter certeza absoluta é perguntar à companhia aérea.
Como o bilhete foi emitido por um agente, a companhia aérea normalmente não estaria disposta (ou contratualmente incapaz de, em muitos casos) de alterar o tíquete, mas pode aconselhá-lo quanto às restrições impostas ao tíquete, inclusive se você precisa completar todas as pernas do bilhete em ordem.
Se você quiser fazer o trabalho de campo sozinho, pode sempre verificar as condições de transporte da companhia aérea.
Coupon Sequence and Use
3.3.
3.3.1. If you have chosen a tariff which provides for you keeping to a strict ticket sequence, please note the following: If carriage on a previous leg of the journey is not used or not used in the sequence anticipated on the ticket, the fare charged for that flight will be the fare that would have applied to your differing but actual route at the point of booking. If this fare is higher than the fare for the route indicated on your ticket, we can make further carriage conditional on you subsequently paying the additional charge which has accrued.
Então eu li isso porque não há cancelamento automático dos últimos trechos do ingresso, mas pode haver uma cobrança feita.
No entanto, A British Airways afirma :
3c2) Your ticket is no longer valid if you do not use all the coupons in the sequence provided in the ticket. Where you change your travel without our agreement and the price for the resulting transportation you intend to undertake is greater than the price originally paid, you will be requested to pay the difference in price. Failure to pay the price applicable to your revised transportation will result in refusal of carriage.
O que indica que eles se reservam o direito de cancelar as pernas restantes, bem como ajustar as cobranças.
A British Airways CoC continua afirmando:
3c5) If you change your transportation without our agreement, your unused flight coupons will not be valid for travel and will have no value and we will not carry you until:
- we or our authorised agents have re-calculated the revised fare for your actual transportation and
- you have paid the difference (if any) between the fare you have already paid and the revised fare which applies to your changed transportation.
If the revised fare is lower than the fare you have already paid, we or our authorised agents will refund you the difference.
3c6) While some changes to your transportation will not result in a change of fare, others, such as changing the place of departure (for example, because you have not used the first flight coupon in your ticket or you have reversed the direction of your travel) may result in a fare increase. Many fares are valid only for travel on the dates and for the flights shown on the ticket. You may not be able to change these at all or only if you pay us an extra fee to do so.
Isso deixa isso explicitamente claro para mim - a menos que você voe com as pernas na ordem do ingresso, o ingresso é inválido até que a British Airways faça o ajuste para acomodar as alterações.