The features of this agreement have become models for the thousands of such agreements that were to follow, although in recent decades some of the traditional clauses of these agreements have been modified (or « liberalized ») in accordance with the « open skies » policy of some governments, particularly the United States.  In addition, certain aspects dealt with in bilateral air services agreements (SAAs) fall within the exclusive competence of the EU and therefore cannot be negotiated autonomously by EU Member States. The Air Services Agreement (ASA), also known as the Air Services Agreement (ATA), is a bilateral or multilateral agreement between states and provides a fundamental framework for the creation of international commercial air services between states. On 1 May 2001, the United States and Brunei, Chile, New Zealand and Singapore signed a multilateral open skies agreement, the Multilateral Agreement on the Liberalization of International Air Transport (MALIAT). The department continues to urge our aviation partners to join MALIAT as an effective means of open skiing with several partners. Since 1992, the Department has adopted an « open skies » policy to eliminate government involvement in airline decision-making on routes, capacity and prices in international markets. Open skiing agreements also contain provisions on business opportunities, safety and protection. The United States has negotiated open skies agreements with more than 100 aviation partners.