A broad group of associations representing airfreight forwarding companies is calling on the U.S. federal government to solicit input from small and medium-sized forwarders before expanding the Air Cargo Advanced Screening (ACAS) programme.

Four of the busiest airports in the country will get tightened cargo security this year to enhance screening of dangerous items, a move that raises concerns from business people who say the extra measure will make the current "slow" service even less efficient.