Originally Posted by
OneWorldSapphire
I don't have data points on this route, but I did an in-app upgrade from Y ---> J for LHR-LAX around Easter (c. $495) and the UK premium cabin tax was factored into that amount. In other words, the amount quoted for the upgrade was all-in and all I paid.
Thanks. Helpful data point. Do you know if in-app upgrades appear on Basic Economy tickets?