Executive Summary
U.S. Customs and Border Protection has extended the phased enforcement period under its Enhanced Air Cargo Advance Screening (ACAS) interim final rule, pushing the date for full enforcement from November 21, 2026 to May 1, 2027. The underlying data requirements themselves are not changing—air carriers and other eligible filers must still submit the additional mandatory and conditional data elements CBP introduced when the Enhanced ACAS rule took effect in November 2025. What has changed is the timeline CBP will use before actively enforcing those requirements, giving the trade community roughly five additional months to complete system integrations and resolve data quality issues. This analysis explains what the extension does and does not cover, why CBP granted it, and how air carriers, forwarders, and other ACAS filers should use the additional time.

CBP Gives Air Carriers More Time on Enhanced ACAS Compliance

(CBP延长增强型ACAS执法宽限期至2027年5月)

1 · What Actually Changed

On the date this extension was announced, CBP notified the trade community through a Cargo Systems Messaging Service (CSMS) bulletin that the phased enforcement period established under the Enhanced ACAS interim final rule—originally set to run for twelve months, from November 21, 2025 through November 21, 2026—has been extended to May 1, 2027.

What This Extension Is Not: it is not a delay of the rule itself, and it does not change any of the underlying data requirements. The Enhanced ACAS interim final rule has been in effect since November 21, 2025, and the additional data elements it introduced have applied since that date. What CBP has extended is solely the phased enforcement window—the period during which CBP is prioritizing outreach, technical assistance, and data quality monitoring over strict enforcement action against carriers and filers who have not yet fully complied.

2 · Background: What the Enhanced ACAS Rule Requires

For readers less familiar with the program, ACAS is CBP’s system for pre-departure risk assessment of air cargo destined for the United States. Air carriers and other eligible filers submit specified data as early as practicable, but no later than prior to loading cargo onto an aircraft bound for the U.S., allowing CBP to identify and mitigate potential security risks before cargo enters the air transportation environment.

The Enhanced ACAS interim final rule, published in the Federal Register in November 2025, expanded these requirements by introducing new mandatory data elements that must be submitted at the lowest air waybill level, along with additional conditional data elements required when a shipper is not a verified known consignor, and other elements required only under specific circumstances. This represented a meaningful increase in the volume and granularity of data carriers and filers must now supply for each shipment.

Why the Original Rule Included a Phased Enforcement Period: recognizing that a change of this scope would require carriers, forwarders, and other filers to update internal systems and data collection processes, CBP built a twelve-month phased enforcement period into the original rule. During this period, CBP has focused on stakeholder outreach, technical assistance, and monitoring data quality rather than pursuing full enforcement action against every instance of incomplete or inaccurate data.

3 · Why CBP Extended the Deadline

CBP has stated that the purpose of the extension is to give the trade community additional time to complete system integrations, refine internal compliance procedures, and resolve outstanding data quality issues before full enforcement begins. This suggests that, as the original November 2026 deadline approached, CBP determined that a meaningful portion of the affected trade community was not yet positioned to meet the enhanced data requirements consistently.

Why This Matters: an enforcement extension of this kind is not unusual for a rule of this scope, and it should not be read as a signal that the underlying requirements are being reconsidered or relaxed. CBP has been explicit that the extension is solely a timing adjustment to the enforcement approach for requirements that remain fully in effect. Carriers and filers who have already achieved full compliance gain no material benefit from the extension; it is primarily useful to organizations still working through implementation.

4 · What Continues During the Extended Period

CBP has outlined specific expectations for air carriers and filers during the extended phased enforcement window:

• Continued data submission in accordance with the existing Enhanced ACAS regulatory requirements—the extension does not pause or reduce any submission obligation.
• Prompt correction of data quality issues that CBP identifies, rather than treating flagged issues as lower priority simply because full enforcement has been pushed back.
• Verification of internal system readiness, confirming that carrier and filer systems can meet the technical specifications required once full enforcement takes effect.
• Ongoing coordination with CBP representatives, including Client Representatives for technical questions and the National Targeting Center for operational inquiries, to resolve implementation concerns before the new deadline arrives.

The Practical Distinction: phased enforcement does not mean no enforcement. CBP has continued to monitor data quality throughout the original phased period and is expected to do the same through May 2027. Filers should not interpret the extension as a grace period free of consequence, but rather as additional runway within a period where CBP is still actively watching compliance trends and engaging directly with parties experiencing difficulties.

5 · Practical Considerations for Air Carriers and Filers

Treat the Extension as Additional Runway, Not a Reset

Organizations that were on track to meet the original November 2026 deadline should continue their implementation timeline rather than deprioritizing the work now that additional time is available. Momentum lost during an extension is often difficult to regain closer to the new deadline.

Prioritize Outstanding Data Quality Issues

Any carrier or filer that has received feedback from CBP regarding incomplete, inaccurate, or missing data elements should treat resolving those specific issues as the immediate priority during the extended window, rather than waiting until closer to May 2027.

Confirm System Capability for Full Enforcement

Because the extension exists specifically to allow system integration work to be completed, organizations should use this period to test and validate that their systems can reliably produce all mandatory and conditional data elements at the required air waybill level—not just for a subset of shipments, but consistently across their full cargo volume.

Maintain Active Communication with CBP

Given that CBP has emphasized ongoing coordination as an expectation during the extension, carriers and filers working through implementation challenges should proactively engage their assigned Client Representative rather than waiting for CBP to identify problems independently.

Reassess Verified Known Consignor Status Where Relevant

Since certain conditional data elements depend on whether a shipper holds verified known consignor status, filers working with a high volume of non-verified shippers should confirm whether pursuing that status for key shipper relationships would meaningfully reduce their ongoing data collection burden.

6 · Conclusion: Using the Extension Effectively

A Timing Adjustment, Not a Policy Reversal

CBP’s decision to extend the Enhanced ACAS phased enforcement period reflects a practical acknowledgment that system-wide changes of this scope take time to implement across a large and varied trade community—not a reconsideration of the underlying security objectives driving the rule. The data requirements introduced in November 2025 remain fully in effect, and CBP’s continued emphasis on data quality monitoring during the extension suggests enforcement expectations will only tighten as the new deadline approaches.

What This Means for the Air Cargo Community

For carriers, forwarders, and other ACAS filers, the extension is best treated as a final, defined window to close any remaining compliance gaps rather than an open-ended delay. Organizations that use the additional months to complete system integration, resolve flagged data issues, and strengthen coordination with CBP will be well positioned when full enforcement begins on May 1, 2027—while those that treat the extension as reason to pause preparation risk facing the same compliance pressure they would have faced under the original deadline, simply arriving several months later.

If your organization needs support assessing ACAS system readiness or resolving data quality issues identified by CBP, our trade compliance team is available to help you prepare for full enforcement.

This analysis reflects CBP’s Cargo Systems Messaging Service bulletin announcing the extension of the Enhanced ACAS interim final rule’s phased enforcement period, as well as the underlying interim final rule published in the Federal Register in November 2025. Specific technical requirements and compliance expectations may evolve through additional CBP guidance. Organizations subject to ACAS requirements should monitor official CBP announcements and consult with trade compliance professionals for guidance tailored to their specific operations.