Regulation EC 261/2004 is a European Union law that protects air passengers' rights. It ensures that travelers are compensated if their flights are delayed, canceled, or if they are denied boarding. The regulation applies to flights departing from an EU airport or arriving at an EU airport on an EU airline, providing clear guidelines on compensation amounts based on the distance of the flight. Under EC 261/2004, passengers may receive up to €600 in compensation, depending on the circumstances. Additionally, airlines are required to offer assistance, such as meals and accommodation, during long delays. This regulation aims to enhance passenger rights and improve airline accountability.