Breaking the Limits: How to Defeat Carrier Liability Caps Under the Montreal Convention for Air Cargo Claims

What Is the Montreal Convention and Why Does It Govern Your Air Cargo Claim?

The Montreal Convention of 1999 (formally the Convention for the Unification of Certain Rules for International Carriage by Air) is the primary international treaty governing the liability of air carriers for cargo damage, loss, and delay. Ratified by over 130 states and incorporated into domestic law across the European Union, the United Kingdom, the United States, Canada, Australia, and most major trading nations, it applies to virtually every international air freight shipment moving across borders today.

The Convention replaced the fragmented and outdated Warsaw Convention system, creating a single, coherent framework designed to balance the interests of cargo owners with the commercial viability of the air transport industry. At its core lies a critical compromise: carriers accept strict liability for cargo loss and damage (meaning a claimant does not need to prove fault), but in exchange, that liability is capped at a fixed amount per kilogram of cargo.

For most general freight, this trade-off is reasonable. For high-value, lightweight commodities — pharmaceuticals, semiconductors, precision instruments, luxury goods, and cut diamonds — it creates a catastrophic gap between what is lost and what can be recovered. Understanding how this limit works, and how to challenge it, is essential knowledge for every cargo insurer, freight forwarder, and commodity trader.

The 26 SDR/kg Limit: What It Means in Practice

Under Article 22(3) of the Montreal Convention, the carrier's liability for cargo destruction, loss, damage, or delay is limited to 26 Special Drawing Rights (SDRs) per kilogram. This limit came into effect on 28 December 2024, following an ICAO review that found accumulated inflation had exceeded the 10% threshold required to trigger a revision under Article 24. The previous limit was 22 SDRs per kilogram.

An SDR is an international monetary unit maintained by the International Monetary Fund, based on a basket of five major currencies (US Dollar, Euro, Chinese Renminbi, Japanese Yen, and British Pound Sterling). As of May 2026, 1 SDR is approximately equivalent to USD 1.30, meaning the current limit equates to roughly USD 33.80 per kilogram.

The practical implications of this limit are stark. Consider the following examples:

• A 5-kilogram shipment of biologics worth USD 200,000 would be capped at a recovery of approximately USD 169 under the standard limit.
• A 20-kilogram box of high-end microprocessors worth USD 500,000 would yield a maximum recovery of approximately USD 676.
• A 2-kilogram parcel of cut diamonds worth USD 1,000,000 would be capped at approximately USD 68.

These figures illustrate why the Montreal Convention's cargo liability limit is one of the most commercially significant — and most frequently contested — provisions in international trade law.

How the Limit Applies: Weight, Packages, and the Air Waybill

The liability limit is calculated based on the gross weight of the damaged or lost cargo, not its declared value. Article 22(4) provides important nuance: where only part of a consignment is lost or damaged, the weight used to calculate the limit is the weight of the affected package or packages. However, if the partial loss affects the value of other packages covered by the same air waybill, the total weight of all affected packages may be considered.

This distinction is critically important in practice. Cargo claims professionals must carefully analyse the air waybill structure to determine whether a partial loss triggers a weight calculation based solely on the damaged packages or on the entire consignment. Where a single air waybill covers a large shipment and only a portion is affected, the calculation method can significantly alter the recoverable amount.

The air waybill itself is the foundational document for any Montreal Convention claim. Under Article 11, it constitutes prima facie evidence of the conclusion of the contract, the acceptance of the cargo, and the conditions of carriage. Any discrepancies between the declared weight on the air waybill and the actual weight of the cargo can complicate the quantum calculation and should be investigated at the outset of any claim.

The Critical Exception: Special Declaration of Value

The most reliable and legally straightforward method to bypass the 26 SDR/kg limit is through a special declaration of interest in delivery made at the time the cargo is handed over to the carrier, accompanied by payment of a supplementary fee. This mechanism is expressly provided for in Article 22(3) itself.

When a valid special declaration is made, the carrier's liability is extended up to the declared sum, unless the carrier can prove that the declared sum exceeds the consignor's actual interest in delivery at destination. This is a significant reversal of the burden of proof — the carrier must disprove the declared value, not the claimant prove it.

In practice, however, many shippers and freight forwarders fail to make special declarations for several reasons:

• The supplementary fee charged by airlines can be substantial, sometimes making comprehensive cargo insurance a more cost-effective alternative.
• Freight forwarders may not advise their clients of this option, either through oversight or because it increases the cost of the shipment.
• The declaration must be made at the time of handover — it cannot be made retrospectively after a loss has occurred.

For claims professionals handling high-value air cargo losses where no special declaration was made, the focus must shift to the alternative recovery strategies discussed below.

Challenging the Convention's Applicability: The Period of Carriage

One of the most powerful — and frequently overlooked — strategies for defeating the Montreal Convention's liability cap is to challenge whether the Convention applies to the specific circumstances of the loss at all.

The Convention only governs liability during the "period of carriage by air." Article 18(3) defines this as the period during which the cargo is in the charge of the carrier. Critically, Article 18(4) states that the period of carriage by air does not extend to any carriage by land, sea, or inland waterway performed outside an airport.

If cargo is damaged or lost during surface transport — for example, while being trucked from the airport to a consignee's warehouse — the Montreal Convention may not apply. Instead, the claim may be governed by:

• The CMR Convention for road transport within Europe, which provides an 8.33 SDR/kg limit but with a more accessible "willful misconduct" exception under Article 29.
• Local tort or contract law, which may impose no limit at all.
• The carrier's own conditions of carriage, which may be challenged as unfair or unreasonable.

Establishing exactly where and when the damage occurred is therefore a critical first step in every air cargo claim. This requires immediate action: a thorough inspection of the cargo upon arrival, photographic documentation of the damage, and a careful review of the carrier's handling records, CCTV footage, and temperature logs where relevant.

StilFresh's Remote Inspection service is specifically designed to capture geo-verified, timestamped photographic evidence at the point of discovery, providing the forensic foundation needed to establish the precise location and timing of the damage — which can be the difference between recovering 26 SDRs per kilogram and recovering the full cargo value.

Third-Party Liability: Bypassing the Convention Entirely

The Montreal Convention protects air carriers and, under Article 30, their servants and agents acting within the scope of their employment. However, it does not protect every party in the air cargo supply chain. Where damage is caused by a party who is not the carrier or acting within the scope of the carrier's employment, claims can be pursued under local law without the Convention's liability caps.

Potential third-party defendants in air cargo claims include:

• Ground handling agents operating under independent contracts who mishandle cargo outside the scope of their engagement with the carrier.
• Warehouse operators who store cargo in conditions that cause temperature excursions, contamination, or physical damage.
• Security companies whose negligence facilitates theft or tampering.
• Freight forwarders who provide negligent advice, fail to arrange adequate insurance, or make errors in documentation that contribute to the loss.

Pursuing third-party claims requires careful investigation to establish the chain of custody and identify the specific act or omission that caused the loss. It also requires an understanding of the applicable local law and the limitation periods that apply in the relevant jurisdiction.

Time Bars: The Deadlines That Can Destroy a Valid Claim

Even the strongest air cargo claim can be extinguished by a failure to comply with the Montreal Convention's strict time limits. Article 31 sets out the following mandatory deadlines for written notice of a claim:

• Damage: Written notice must be given to the carrier within 14 days from the date of receipt of the cargo.
• Delay: Written notice must be given within 21 days from the date the cargo was placed at the consignee's disposal.
• Loss: Where cargo is entirely lost, notice requirements are less prescriptive, but a formal claim should be lodged without delay.

Failure to give timely written notice generally bars any action against the carrier, except in cases of fraud. The two-year limitation period for bringing legal proceedings runs from the date of arrival of the aircraft at the destination, the date on which the aircraft ought to have arrived, or the date on which the carriage stopped.

These deadlines are strictly enforced. Courts in the UK, EU, and US have consistently held that late notice, even by a single day, can be fatal to a claim. Cargo owners and their insurers must therefore act immediately upon discovering a loss or damage, issuing written notice to the carrier as a matter of priority and preserving all evidence.

Jurisdiction Strategy: Choosing the Right Forum

The Montreal Convention provides claimants with a choice of forum under Article 33. An action may be brought in the territory of one of the States Parties, either before the court of:

• The domicile of the carrier;
• The carrier's principal place of business;
• The place where the contract was made; or
• The place of destination.

This choice of forum can be strategically significant. Different jurisdictions may apply different interpretations of the Convention, offer different procedural advantages, or have more favourable rules on costs recovery. For example, English courts have a well-developed body of case law on air cargo claims and offer efficient commercial litigation procedures. US courts may offer different discovery tools that can be valuable in complex cases.

The choice of jurisdiction should be made in consultation with specialist aviation law counsel at the outset of any significant claim, particularly where the quantum at stake justifies the investment in strategic litigation planning.

Cargo Insurance: The Essential Backstop

Given the limitations of the Montreal Convention's liability framework, comprehensive cargo insurance is not merely advisable — it is essential for any business shipping high-value goods by air. A well-structured "all-risk" cargo insurance policy will cover the full commercial value of the cargo, regardless of the carrier's liability limits, and will typically cover losses arising from inherent vice, inadequate packing, and other excluded perils that the carrier is not liable for.

However, cargo insurance policies are not without their own complexities. Common coverage gaps include:

• Inadequate sum insured (insuring for invoice value rather than replacement cost).
• Failure to notify the insurer of the loss within the policy's required timeframe.
• Exclusions for specific cargo types or routes.
• Disputes over the cause of loss (e.g., whether temperature damage was caused by an insured peril or inherent vice).

Where cargo insurance responds to a loss, the insurer steps into the shoes of the cargo owner through subrogation and may pursue the carrier for recovery. The carrier's Montreal Convention limit then becomes the ceiling for the insurer's subrogated recovery, making the strategies discussed in this article equally relevant to cargo underwriters and their claims teams.

A Practical Claims Checklist for Air Cargo Losses

When an air cargo loss or damage is discovered, the following immediate steps should be taken to preserve all recovery options:

• Document everything immediately: Photograph the cargo, packaging, and any visible damage before moving or disposing of anything. Use geo-verified, timestamped photography where possible.
• Issue written notice to the carrier: Do not rely on verbal complaints. Send written notice of damage within 14 days (or 21 days for delay) to the carrier, clearly identifying the shipment by air waybill number.
• Preserve the air waybill and all shipping documents: The air waybill, commercial invoice, packing list, and any temperature records are essential evidence.
• Appoint an independent cargo surveyor: A professional survey report establishing the nature, extent, and cause of the damage is the cornerstone of any successful claim.
• Investigate the chain of custody: Determine exactly where and when the damage occurred. Request the carrier's handling records, CCTV footage, and temperature logs.
• Notify your cargo insurer: Comply with the policy's notification requirements without delay.
• Assess third-party liability: Identify all parties who handled the cargo and assess whether any third-party claims can be pursued outside the Convention's limits.

Conclusion: Expertise Is the Difference Between Recovering Cents and Dollars

The Montreal Convention's 26 SDR/kg liability limit is a powerful shield for air carriers, but it is not an impenetrable one. For cargo owners and their insurers, the path to maximum recovery lies in immediate action, meticulous evidence preservation, strategic analysis of the Convention's scope, and the identification of third-party liability outside the Convention's framework.

The difference between a recovery of a few hundred dollars and the full commercial value of a lost shipment often comes down to the expertise and speed of the claims team deployed in the critical hours and days following a loss. Professional cargo claims management is not a luxury — it is a commercial necessity for any business that relies on air freight for high-value goods.