Has nothing to do with the airline (who've refunded everything they owed) and all to do with your credit card provider and the exchange rate they're using on any given day when processing the refund to your account. They wouldn't have come after you had the exchange rate meant your £ based ticket gave you more $ than you originally paid. It's just something to be mindful of on future foreign currency transactions that exchange rates do fluctuate. And in both directions.
Last edited by 1Aturnleft; Oct 24, 2020 at 6:34 pm