Flight cancellations have hit airlines worldwide as the war in the Middle East strains jet fuel supplies and pushes up prices, but the disruption doesn’t end there. Travelers could be forced to navigate a confusing web of passenger protections that vary widely depending on where they’re flying. And the timing is amplifying the impact. “These pressures are arriving at a time when summer travel demand is ramping up, with major events such as the World Cup expected to put additional strain on airports ,” said Eric Napoli, chief legal officer at AirHelp, a company that helps travelers secure compensation for flight disruptions and advocates for passenger rights. Here’s what to know if your flight is canceled. Are these cancellations happening at the last minute? In most cases, no. At least for now, fuel-related cuts are often being made days or weeks in advance. Lufthansa Group, for example, said this week it is cutting 20,000 short-haul flights across its network through October.…