On May 4, 2018, U.S. Customs and Border Protection (CBP) announced in Cargo Systems Messaging Service (CSMS) #18-000328 an updated In-Bond CATAIR implementation guide.
The updated guide includes information regarding the upcoming requirement for a FIRMS code upon In-bond arrival for all modes of transportation except for air.
The CSMS may be found here:
https://csms.cbp.gov/viewmssg.asp?Recid=23527&page=&srch_argv=&srchtype=&btype=&sortby=&sby=
The updated In-Bond CATAIR implementation guide may be found here: