with the increase of air traffic,there is a continuously growing demand for capacity at congested airport. slots,that is to say the permission to land and take-off at a specific date and time at congested airport,are essential for airlines'operations.slots will be distributed in an equitable,non-discriminatory and transparent way by an independent coordinator.the aim of the EU framework is to ensure the fullest and more efficient use of existing capacity at congested EU airports while maximizing consumers'benefits and promoting the competition.