Originally Posted by AF1
I believe that once you've made final payment you are good to go. They can add surcharge before final payment. Same applies to airlines. If you book your ticket, and the airlines says that it will begin putting fuel surcharge on future tickets; you won't be charged; because you've already bought your ticket.
On Princess website:
Top Stories : Princess Cruises
In my contract for next cruise on Princess:
Princess reserves the right to impose a fuel supplement of up to $9 per person per day on all passengers if the NYMEX oil price exceeds $70 per barrel, even if the fare has already been paid in full. ćAir Fare and Air Government Fees and Taxes are subject to change until final payment. Due to the volatility of air prices, please be advised that all air prices are subject to change and not guaranteed until full payment.