CSMS Weekly Digest: Aug 22 - Aug 28, 2026
Here's your weekly summary of 10 CSMS messages from U.S. Customs and Border Protection.
Action Required(4)
CBP has published a Final Rule mandating ACE Electronic Export Manifests for rail mode, and has formally terminated the 'Flying Trucks' process — both requiring immediate operational review. Brokers should also update HTS reporting order practices for entries involving 98/99 classifications and note changes to AESTIR Appendix A Message 802.
U.S. Customs and Border Protection publishes Final Rule to require Automated Commercial Environment (ACE) Electronic Export Manifest (EEM) for the Rail Mode of Transportation - Final Rule - 19 CFR Parts 103, 113, 123, and 192
On August 26, 2026, U.S. Customs and Border Protection (CBP) published a final rule that will require an Electronic Export Manifest (EEM) for cargo departing by rail to Mexico or Canada. Mandatory ele...
Updated Guidance: Entry Summary Order of Reporting for Multiple HTS when 98 or 99 HTS are Required
BACKGROUND: The purpose of this message is to update the order of reporting in ACE to report multiple Harmonized Tariff Schedule of the United States (HTSUS) classifications for an article on the sam...
Termination of the “Flying Trucks” Process and Compliance with Truck Manifest Regulations
CBP initiated the "Flying Trucks" process in the mid-to-late 2000s to test functionality between truck eManifest and Multi-Modal Manifest (MMM) capabilities. CBP intended to sunset this process upon t...
Update to AESTIR Appendix A – Commodity Filing Response Message 802
At the request of the Bureau of Industry and Security (BIS), Customs and Border Protection (CBP) will set AESTIR Commodity Response Code 802 to Fatal on September 25, 2026. The code is currently set t...
Policy Guidance(2)
CBP has issued updated guidance on the correct order of reporting multiple HTS codes when 98 or 99 chapter classifications are required — review and align your filing practices accordingly. Additionally, the informal 'Flying Trucks' process has been officially terminated, meaning all truck manifest regulations must now be strictly observed with no exceptions.
Updated Guidance: Entry Summary Order of Reporting for Multiple HTS when 98 or 99 HTS are Required
BACKGROUND: The purpose of this message is to update the order of reporting in ACE to report multiple Harmonized Tariff Schedule of the United States (HTSUS) classifications for an article on the sam...
Termination of the “Flying Trucks” Process and Compliance with Truck Manifest Regulations
CBP initiated the "Flying Trucks" process in the mid-to-late 2000s to test functionality between truck eManifest and Multi-Modal Manifest (MMM) capabilities. CBP intended to sunset this process upon t...
Enforcement(1)
CBP has opened registration for its September 2026 Trade Enforcement Webinar series — attendance is recommended for brokers looking to stay current on enforcement priorities and compliance expectations.
System Update(3)
Three system-level changes are in effect this week: the ACE EEM Final Rule for rail mode updates 19 CFR Parts 103, 113, 123, and 192; AESTIR Appendix A has been revised for Commodity Filing Response Message 802; and the ACE CATAIR Error Dictionary now includes new error code F883, blocking PSCs from modifying IEEPA HTS values.
U.S. Customs and Border Protection publishes Final Rule to require Automated Commercial Environment (ACE) Electronic Export Manifest (EEM) for the Rail Mode of Transportation - Final Rule - 19 CFR Parts 103, 113, 123, and 192
On August 26, 2026, U.S. Customs and Border Protection (CBP) published a final rule that will require an Electronic Export Manifest (EEM) for cargo departing by rail to Mexico or Canada. Mandatory ele...
Update to AESTIR Appendix A – Commodity Filing Response Message 802
At the request of the Bureau of Industry and Security (BIS), Customs and Border Protection (CBP) will set AESTIR Commodity Response Code 802 to Fatal on September 25, 2026. The code is currently set t...
Update to ACE CATAIR Error Dictionary: New Error F883 PSC NOT ALLOWED TO MODIFY IEEPA HTS
Please be advised that an updated version of the *ACE CATAIR Error Dictionary V52* has been posted under the Supporting Documents: *Documentation for Entry Summary Chapters* section on CBP.gov [ https...
System Maintenance(2)
ACE Certification will undergo invasive maintenance on August 26 from 5:00–8:00 p.m. ET, followed by ACE Production maintenance from 10:00 p.m. ET August 29 through 4:00 a.m. ET August 30 — plan filings and system integrations accordingly.
ACE Production Standard Invasive Maintenance from 10:00 p.m. ET Saturday, August 29, 2026 to 4:00 a.m. ET Sunday, August 30, 2026
There will be ACE production standard invasive maintenance from 10:00 p.m. ET Saturday, August 29, 2026 to 4:00 a.m. ET Sunday, August 30, 2026.
ACE Certification Standard Invasive Maintenance Window on August 26, 2026 from 5:00 p.m. to 8:00 p.m. ET
There will be an ACE certification standard invasive maintenance window on August 26, 2026 from 5:00 p.m. to 8:00 p.m. ET.
General Notice(2)
CBP is actively soliciting broker and importer feedback through the 2026 ACE User Satisfaction Survey — submissions are encouraged to help shape future ACE system improvements.
ACE User Satisfaction Survey – Your Input Matters!
Attention all ACE users - the 2026 ACE User Satisfaction Survey is now open, and CBP wants to hear from you! Fill out the satisfaction survey and let your voice be heard! U.S. Customs and Border Prot...
YOUR FEEDBACK IS REQEUSTED: 2026 ACE User Satisfaction Survey is Now Open!
Attention all ACE users - the 2026 ACE User Satisfaction Survey is now open, and CBP wants to hear from you! Fill out the satisfaction survey and let your voice be heard! U.S. Customs and Border Prot...