Fiji Airways allows one to upgrade their seats to the premium cabin if they have already booked their ticket in the standard cabin. Moreover, the airline offers numerous ways to do so. Travelers can make a Fiji Airways Upgrade through options, such as bidding for the upgrade, and if one is a member of the Tabua club, then they can use a complimentary upgrade option. For more information related to flight upgrades, visit the official website of Fiji Airways or read the blog linked above.