European Civil Aviation Administration has made improvements in the rules governing the operation of airlines, based on the requirements of international standard. These advanced rules apply to airlines of all countries that have signed the corresponding agreement. However, such rules could also be applied to other countries and airlines. This allows the airlines to improve the quality and safety. A similar situation exists in the field of maintenance of aircraft. Part M and EASA 145 contain a set of modern rules, which have been successfully applied in other countries. The company provides services in the field of maintenance and has a corresponding certificate, and now should not receive additional approval from the national civil aviation authorities in the implementation of contracts for maintenance services.