Homeland Security Today on 13th June reported that US Customs and Border Protection (CBP) and the Transportation Security Administration announced that the Air Cargo Advance Screening (ACAS) programme came into effect on 12th June requiring the submission of advanced air cargo information on shipments arriving in the US from a foreign location. Previously this was a voluntary process in which many airlines already participated globally, the programme requirements are now mandatory for airlines flying to the US. Participating carriers submit a subset of required pre-arrival air cargo data to CBP at the earliest point practicable and prior to loading the cargo onto aircraft destined to or transiting through the US. Contrary to some media reports, it says that there is no current specific terrorist threat to cargo bound to the US, but that terrorists continue to target the aviation sector.
https://www.hstoday.us/federal-pages/dhs/cbp/air-cargo-advance-screening-program-goes-into-effect/
CBP provides guidance, FAQ and a factsheet at –
https://www.cbp.gov/border-security/ports-entry/cargo-security/acas