Airlines around the world are canceling flights as the war in the Middle East squeezes global jet fuel supplies and pushes up prices. But experts say the real challenge for travelers goes beyond the disruptions. Passenger rights vary widely depending on where you fly. The European Union and United Kingdom have some of the strongest protections for air travelers. The U.S. and Canada have consumer protection rules in place, but they tend to be more limited. Across the Asia-Pacific region, protections vary by country. Still, aviation and security experts say the first step after a cancellation is to check your airline’s app immediately for rebooking options. They also urge travelers to research passenger rights before departure.