EC 261/2004 is a European Union regulation that establishes rules for air passenger rights. It provides compensation and assistance to passengers in cases of flight delays, cancellations, or denied boarding. The regulation aims to protect travelers and ensure they receive fair treatment from airlines. Under EC 261/2004, passengers may be entitled to financial compensation depending on the flight distance and the length of the delay. Airlines are also required to offer care, such as meals and accommodation, when flights are significantly delayed or canceled. This regulation enhances accountability and transparency in the airline industry.