The European Union has concluded Bilateral Agreements on Civil Aviation Safety (also called ‘BASAs’) with Brazil, Canada, China, Japan and the United States. The Trade and Cooperation Agreement with the United Kingdom also contains a chapter on aviation safety. The overall objective of these agreements is to formalise cooperation in certain areas of aviation safety. A BASA sets out obligations and methods for cooperation between the authorities to avoid unnecessary duplication of evaluation, and to facilitate the certification of aeronautical products by the civil aviation authorities. A BASA therefore supports trade in aircraft and related products, while ensuring the highest levels of aviation safety.