Aviation law is the branch of law that relates to aircraft, flight regulations, safety agreements, and associated legal and business concerns. Some aviation law intersects with admiralty law and is international in nature. However, the business aspects of airlines and their regulation also fall under aviation law. In the United States, the Federal Aviation Administration (FAA), governs applied aspects of flight. Internationally, the governing body is the International Civil Aviation Organization (ICAO) which mediates international concerns to an extent regarding aviation law. The ICAO is a branch of the United Nations. In the United States and most European nations, aviation law is considered a federal or state-level concern and is regulated thereby at that level. In the U.S., states cannot govern aviation matters in most cases directly but look to Federal laws and case law for this function instead. Aviation law, however, is not in the United States held under the same Federal mandate of jurisdiction as admiralty law; that is, which the United States Constitution provides for the administration of admiralty, it does not provide such for aviation law. Space law, which governs matters in outer space beyond the Earth’s atmosphere, is a rather new area of law but one that already has its own journals and academic support. Expectedly, much of space law is connected to aviation law.