Open skies policy in America goes hand in hand with the globalization of American airlines. By providing U.S. airlines with unlimited access to our partners` markets and flight rights at points between and beyond, open-ski agreements offer maximum operational flexibility to U.S. airlines worldwide. One of the first AAS after World War II was the Bermuda Agreement, signed in 1946 by the United Kingdom and the United States. The characteristics of this agreement have become models for the thousands of agreements that were to follow, although in recent decades some of the traditional clauses of these agreements have been amended (or “liberalized”) in accordance with the “open skies” policy of some governments, particularly the United States.  In 1913, a bilateral exchange of notes  between Germany and France was signed in the first agreement to provide airship services. The United States has implemented open-air air travel with more than 125 partners. These include several important agreements dealing with rights and commitments with several aviation partners: the 2001 Multilateral Agreement on the Liberalization of International Air Transport (MALIAT) with New Zealand, Singapore, Brunei and Chile, to which Tonga and Mongolia subsequently joined; the 2007 Air Services Agreement with the European Union and its Member States; 2011 agreement between the United States of America, the European Union and its Member States, Iceland and Norway. The United States maintains more restrictive air transport agreements with a number of other countries, including China. An air services agreement (also known as the ATA or ASA) is a bilateral agreement that allows international commercial air services between signatories. The Department of Foreign Affairs, in collaboration with the Department of Transport and the Ministries of Commerce, negotiates agreements with foreign governments that form the framework of commercial air service.
The most liberal of these civil air transport agreements, the so-called “open skies” agreements, have offered the possibility of extending international passenger and cargo flights to and from the United States. They stimulate economic growth by stimulating travel and trade, increasing productivity and stimulating quality jobs. This is what open skies agreements do by removing state interference in airlines` commercial decisions on routes, capacity and pricing, allowing airlines to offer consumers and shippers a more affordable, convenient and efficient air service. Air Services Agreements (ASAs) are formal contracts between countries – Memorandums of Understanding (Memorandum of Understanding) and formal diplomatic notes. It is not mandatory to have an ASA for the operation of international services, but cases where contract-free services exist are rare. The bilateral system is based on the Chicago Convention and related multilateral treaties. The Chicago Convention was signed in December 1944 and has governed international air services ever since. the convention also contains a number of annexes covering issues such as aviation safety, safety monitoring, seaworthiness, navigation, environmental protection and facilities (acceleration and departure at airports).
In principle, all ASAs should be registered by the DAGMAR International Civil Aviation Organization of the ICAO air agreements and agreements database, but this source is not absolutely complete.