The European Union's Authorized Economic Operator (AEO) program is based on cooperation between customs authorities and economic operators to maintain or increase international supply chain security. Enrollment in the scheme is based on a voluntary commitment by economic operators, which must fulfill the conditions set out in EU customs legislation. AEO is a quality system - the economic operator is granted the most favorable treatment and can apply for the highest level of approval from the customs authorities. Thanks to this reliability, these entities enjoy a number of (physical and material) advantages to other business entities. The most important customs license.