China Is Detaining Panama-Flagged Ships at Record Rates. Here Is What Shippers Should Understand.

Key Takeaways

In March 2026, 91 out of 123 vessels detained at Chinese ports were registered under Panama’s flag. That is roughly 74%, far above any historical norm.
The detentions are widely understood as retaliation after Panama’s Supreme Court voided CK Hutchison’s concession to operate the Balboa and Cristobal terminals at the Panama Canal.
The U.S. Federal Maritime Commission (FMC) is “closely monitoring” the situation. FMC Chairman Laura DiBella said the inspections “appear intended to punish Panama” and were carried out under “informal directives.”
COSCO has suspended services at Panama’s Balboa port and rerouted operations to other terminals. CK Hutchison is pursuing over $2 billion in arbitration claims against Panama.
Panama is the world’s largest ship registry by number of vessels. The flag is used across container, tanker, and bulk fleets globally, including by Chinese carriers. That means the impact is not limited to one trade lane.
For shippers and forwarders, the risks are vessel delays at Chinese ports, potential schedule disruption, and uncertainty about how far the retaliation extends.

Who This Is For

This post is for logistics professionals, freight forwarders, importers/exporters, and supply chain managers with cargo moving through Chinese ports or on Panama-flagged vessels. Even if your cargo is not directly on a detained ship, the downstream effects on schedules, port congestion, and carrier network adjustments are relevant.

What Happened: The Panama Canal Port Dispute

The chain of events starts in Panama, not China.

January 30, 2026: Panama’s Supreme Court invalidated the legal framework supporting CK Hutchison Holdings’ concession to operate the Balboa and Cristobal port terminals. Balboa sits on the Pacific side of the Panama Canal; Cristobal sits on the Atlantic side. CK Hutchison, through its subsidiary Panama Ports Company (PPC), had operated these terminals since the late 1990s. The court ruled that the original concession and its 25-year extension (signed in 2021) lacked a proper legal basis, following an audit that identified alleged irregularities.

Why it matters geopolitically: CK Hutchison is Hong Kong-based. The terminals were part of a broader deal in which Hutchison had agreed to sell dozens of global port assets to a consortium of BlackRock and MSC’s Terminal Investment Limited for nearly $23 billion. That deal stalled. U.S. President Trump had previously accused China of exerting undue influence over Panama Canal operations. Washington saw the Hutchison concession revocation and the appointment of Maersk APM Terminals and MSC TIL as interim operators as a positive outcome for U.S. strategic interests.

Beijing saw it differently. China’s Ministry of Transport summoned Maersk and MSC to Beijing for discussions. CK Hutchison rejected the ruling and filed international arbitration claims, most recently on March 24, seeking over $2 billion in damages. China’s Foreign Ministry has described Panama’s actions as a failure to respect contractual commitments.

China’s Response: Detention Surge

China’s port state control inspections of Panama-flagged vessels have increased dramatically:

Month	Total detentions in Chinese ports	Panama-flagged detentions	Panama share
January 2026	71	23	~32%
February 2026	45	19	~42%
March 2026	123	91	~74%
April 1-3, 2026	13	7	~54%

Source: Tokyo MOU detention lists, as reported by Newsroom Panama, WWD/Sourcing Journal, and FMC statements.

The Tokyo MOU is a regional ship inspection agreement among 22 maritime authorities in the Asia-Pacific. Its detention data is the most comprehensive public dataset for inspections in the region.

The March numbers are extraordinary. The 123 total detentions in Chinese ports in a single month exceed any monthly figure from 2025. The 91 Panama-flagged detentions in March mean that more than half of all vessels detained across the entire Asia-Pacific region were Panamanian ships held in China.

Port state control detentions are officially about safety. Ships can be detained for deficiencies in equipment, documentation, or operational standards. But the concentration and timing make a safety-only explanation hard to sustain. FMC Chairman DiBella stated directly that the inspections “were carried out under informal directives and appear intended to punish Panama after the transfer of Hutchison’s port assets.”

China’s Foreign Ministry has called the accusations “groundless,” but declined to directly answer whether it was specifically targeting Panamanian vessels.

COSCO’s Balboa Suspension

In a parallel move, COSCO Shipping (China’s state-owned container line) suspended services at Panama’s Balboa port and rerouted its loops.

According to customer advisories, COSCO canceled confirmed bookings to Balboa and directed empty containers to the Manzanillo and Colon terminals on the Atlantic side. Import cargo already at Balboa was released normally. Transshipment cargo on COSCO’s West Coast South America and Caribbean services was shifted to Mexico’s Lazaro Cardenas and Colombia’s Buenaventura.

Panama’s government asked COSCO to reconsider. As of early April, COSCO has not reversed the decision. Panama’s minister for canal affairs, Jose Ramon Icaza, told reporters: “The Cosco issue has really taken us a little bit by surprise.”

For shippers using COSCO on routes that transshipped through Balboa, this means booking changes, possible transit time increases, and the need to confirm alternative routing.

The FMC Response

The FMC is the U.S. federal agency responsible for regulating international ocean shipping. Its involvement signals that Washington sees the China-Panama dispute as a potential threat to U.S. trade.

FMC Chairman DiBella’s statement (issued around April 1, 2026) made several notable points:

The FMC has authority to investigate whether foreign government practices create conditions unfavorable to U.S. shipping.
Panama-flagged ships carry a “meaningful share” of U.S. containerized trade.
The FMC is not aware of recent precedent where port state control inspections were used in what appears to be a punitive manner at this scale.

The FMC has not announced formal investigative action yet, but DiBella’s language goes further than typical monitoring statements. The explicit characterization of the detentions as appearing punitive is unusual for an agency that normally maintains diplomatic neutrality on foreign government behavior.

Separately, U.S. Secretary of State Marco Rubio issued a statement on April 2 saying the detentions “raise serious concerns about the use of economic tools to undermine the rule of law in Panama” and that they “destabilize supply chains, raise costs for businesses and consumers, and erode confidence in the international trading system.”

Why Panama’s Flag Matters for Global Shipping

Panama has the world’s largest ship registry by number of vessels. Ships registered (“flagged”) in Panama span every segment: containers, tankers, bulk carriers, and offshore vessels. Many are owned and operated by companies based in other countries, including China.

The flag a vessel flies determines which country’s maritime regulations apply, which port state control regime it falls under, and, increasingly, how it is treated in geopolitical disputes.

The fact that Chinese carriers themselves operate Panama-flagged ships adds a layer of complexity. Several Chinese-owned vessels were reportedly among those detained in March, suggesting that the inspection campaign is being applied broadly rather than selectively targeting foreign operators.

For shippers, this means the detention risk is not limited to a specific carrier or trade lane. Any vessel calling a Chinese port under the Panama flag could face heightened inspection scrutiny and potential delays.

Operational Implications for Shippers and Forwarders

Vessel schedule risk at Chinese ports

If vessels on your routes are Panama-flagged and calling Chinese ports, there is an elevated risk of detention-related delays. A detention can last anywhere from a few hours to several days depending on the deficiencies cited and the resolution process.

Carrier network adjustments

COSCO’s Balboa suspension is the most visible change, but other carriers may adjust rotations, transshipment hubs, or vessel deployments in response to the broader situation. Carriers do not always announce these changes publicly in advance.

Transshipment routing changes

Balboa is a significant transshipment hub for cargo moving between Asia, the Americas, and the Caribbean. If COSCO’s suspension continues and other carriers shift volumes, shippers may see routing changes that affect transit times, particularly on West Coast South America and Caribbean trades.

Insurance and risk exposure

Prolonged detention of vessels can trigger insurance and demurrage questions. If cargo is on a detained vessel, the cargo interest may face delays without clear recourse against the carrier if the detention is classified as a force majeure or government action.

Flag re-registration as a possible response

If the detention campaign continues, some shipowners may consider re-flagging vessels away from Panama to avoid inspection risk. This would be a significant and unusual step, but it has precedent in other geopolitical disputes. Any large-scale re-flagging would create administrative disruption and potential gaps in coverage.

What to Check Now

Know the flag of vessels on your active bookings. If you are shipping on a Panama-flagged vessel through a Chinese port, monitor for schedule changes and potential delays.
Check carrier advisories for routing changes. COSCO has already rerouted away from Balboa. Other carriers may make adjustments. Check with your carrier or forwarder for the latest service status on routes involving the Panama Canal or Chinese ports.
Review transshipment exposure. If your cargo transships through Balboa, Manzanillo, or Colon, confirm that your routing has not been altered.
Monitor FMC developments. If the FMC escalates from monitoring to a formal investigation, it could lead to regulatory action that affects carrier behavior on U.S. trades. This is not imminent, but it is worth watching.
Be aware of the broader context. This dispute intersects with the CK Hutchison/BlackRock/MSC port deal, U.S.-China relations, and the Panama Canal’s strategic importance. The situation could escalate or de-escalate depending on diplomatic and legal developments that are hard to predict.

Operational Note: When vessel detentions or port-level disruptions create unplanned delays, the first operational question is usually: which of my shipments are affected? Answering that quickly requires knowing where each container is, which vessel it is on, and what the vessel’s current status is. That connection between cargo-level tracking and vessel-level events is where early awareness turns into faster response.

Related: FMC Strengthens Its Hand on Carrier Conduct

In a separate but thematically connected development, the D.C. Circuit Court of Appeals on March 31, 2026, upheld an FMC rule that defines when ocean carriers unlawfully refuse to negotiate or provide vessel space to shippers.

The rule, stemming from the Ocean Shipping Reform Act of 2022 (OSRA), was challenged by the World Shipping Council (WSC), which represents roughly 90% of global liner capacity. The court rejected the challenge on all counts.

Key elements upheld:

The FMC can consider pricing behavior. Quoting rates far above market value can be treated as evidence of a refusal to negotiate in good faith.
Carriers must submit annual documented export policies to the FMC, detailing pricing strategies, services offered, equipment provision, and markets served.
The removal of “business decisions” as a listed factor does not prevent carriers from raising business justifications in individual cases, but it does mean the FMC is not required to defer to vague business rationale.

For shippers, this ruling matters because it strengthens the FMC’s enforcement toolkit during a period when carrier behavior is under unusual pressure from multiple directions: fuel surcharges, Middle East disruption, and now geopolitical retaliation through port state control. The FMC is signaling it will use its authority across these fronts.