A regulation under EU legislation known as EC 261/2004 protects the rights of air passengers by making airlines financially liable for unplanned delays in air travel, so long as the airline has reasonable control over the cause.
EC 261 is widely regarded as one of the most comprehensive laws concerning to passenger rights. It not only describes the minimum standard of care that airlines are required to provide, but it also specifies the mandatory compensation that airlines must pay, which varies from €250 to €600. This reimbursement is valid in situations like 3 hours or longer flight delays, cancellations of flights fewer than 14 days in advance, and denied boarding.
EC 261 provides protection to all travelers leaving an EU airport. Passengers travelling from outside locations to Europe may also be eligible for coverage in some cases.