American travelers could be facing one of the most expensive summers for European vacations ever as airlines slash thousands of flights , add surcharges to transatlantic routes and hike prices. It all comes down to Europe’s jet fuel supply, about 40% of which passes through the Strait of Hormuz . The crucial trade route has been blocked off due to the Iran war , more than doubling fuel costs for European airlines. “There are alarms going off across Europe right now. It is considered critically