There's a chance that the exchange rate may favor the euro at the time of sale, rather than the dollar, which was worth slightly more than the euro in mid-2025. So, if you had bought $100 worth of Airbus in mid-May 2025, you'd likely have spent just 88.54 euros at an exchange rate of 1 euro to 1.13 U.S. dollars.
Additional risk is introduced when the currency rate fluctuates dramatically. For example, if it had flipped to the opposite, where 1.13 euros was worth just 1 U.S. dollar, it could have been pretty painful. In that situation, even if your investment increased to 100 euros from 88.54 euros, your dollar value would still have decreased to $88.49 from your original $100 due to the exchange rate.
This is when currency hedging, the practice that creates a currency-neutral investment, makes a lot of sense. It helps to mitigate the risk that's introduced by trades made in various foreign currencies.