Originally Posted by Majuki

Are prices on board denominated in USD? If so, I imagine this is like what BA does with their ticketing. It's fine to keep the current card on file in that case as long as it doesn't have a FTF.

BA processes (or at least did in the past) their US website transactions in the UK even though the transactions are in USD. This used to be frustrating before the days of 0% FTFs since you'd get hit with a FTF on a USD transaction.