The Air Cargo Advance Screening (ACAS) program was implemented on June 12, 2018. Under ACAS, air carriers are required to submit advanced air cargo information for all shipments from foreign locations coming into the United States. Prior to June 12, 2018, the submission of such data was a voluntary process though many airlines were already participating. As it now stands, it is mandatory for all airlines flying into the Us to submit a subset of air cargo data to the US Customs and Border Protection Agency prior to loading the cargo onto the aircraft.