Bilateral air services agreements were then extended to multilateral air services agreements. "A multilateral air services agreement is the same as a bilateral air services agreement, the only difference being that it affects more than two states parties" (Wikipedia)4. These agreements subsequently resulted in another form of agreement, known as the "open skies" agreement. conduct comparative analyses of air services agreements; An air services agreement (also known as the ATA or ASA) is a bilateral agreement that allows international commercial air services between signatories. 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. These freedoms remain the basis of the rights traded today as part of the air services negotiations (the Australian government. Ministry of Infrastructure and Transport, 2009)2. Since the use of aircraft within the borders of a single country makes no economic sense, it has become necessary for countries to find a way to expand their areas of exploitation. 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 such agreements that were to follow (Kasper 1988)3. A bilateral air services agreement is reached between two states parties, 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. 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.  -Rules for the registration process, which are listed in Doc 6685 – ICAO`s Rules for Registration of Air Agreements and Agreements. The inclusion of agreements in the WASA does NOT replace the requirement for states to register these agreements or amendments in accordance with Article 83 of the Chicago Convention. The summaries of the provisions have no formal interpretation of the intentions of the parties to the air transport agreements or the content of those agreements. Abstracts therefore do not replace the actual text of the agreement.