The Air Cargo Advance Security Screening (ACAS) was designed to provide U.S. Customs and Border Protection (CBP) with data about inbound air shipments prior to loading at a foreign port. ACAS enables CBP to identify high-risk shipments, speeding the movement of lower-risk shipments while resources can focus on higher-risk shipments for additional screening. Since its inception, CBP requires all carriers to submit this pre-arrival data before loading cargo onto aircraft destined for or transiting through the United States.