Most air services are excluded from U.S. trade agreements. When air services are included, the scope is very limited. In these cases, the Office of International Aviation cooperates with the Office of the United States Trade Representative and the State Department to ensure that these provisions are consistent with U.S. aviation policy. In the General Service Tariff Agreement (GATS), the Air Services Annex explicitly limits air service coverage to aircraft repair and maintenance operations, computerized reservation systems, and the sale and marketing of air transport. Under our bilateral and multilateral free trade agreements (FTAs), air service coverage is limited to aircraft repair and maintenance services and specialized air services. For more information, please contact us. An air services agreement (also known as the ATA or ASA) is a bilateral agreement that allows international commercial air services between signatories. 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.
 A bilateral air services agreement is being concluded between two contracting countries, which liberalizes commercial civil aviation services between these countries. Bilateral air services agreements allow designated airlines in these countries to operate commercial flights covering passenger and cargo transport between the two countries. In addition, they generally regulate the frequency and capacity of air services between countries, pricing and other commercial aspects. 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). The international air services agreement refers to an international agreement on the liberalisation of international air transport. It is also known as the Five Freedoms Agreement. It reaffirms three other freedoms in air transport, in addition to the two freedoms that fall under the international air transport agreement. Three freedoms offered by the international air transport agreement are: the use of aircraft within the borders of a single country has no economic meaning, so it has become necessary for countries to find a way to expand their areas of operation. This has led to several agreements between two countries in the form of bilateral air services agreements.
One of the first air agreements after World War II was the Bermuda Agreement. This agreement was signed in 1946 by the United States of America and the United Kingdom. The characteristics of the Bermuda Agreement became models for the many agreements that were to follow (Kasper, 1988) 3. In 1913, a bilateral exchange of notes  between Germany and France was signed in the earliest of the agreement to provide airship services. The Chicago Convention established that no international air service without authorization can be operated on or on the territory of a contracting state. In the following years, ICAO developed a number of traffic rights known as Freedoms of the Air.