Montreal Convention: Air Cargo Liability Explained

The Montreal Convention forms the legal backbone of international air cargo transport. Adopted in 1999 under the auspices of the International Civil Aviation Organization (ICAO), it governs carrier liability for loss, damage, or delay of freight. For any professional shipping goods by air, understanding this framework is essential to protect commercial interests and manage risk effectively. The experts at Private Jets Connect break down the key points below.

Historical Context: From Warsaw to Montreal

The Warsaw Convention of 1929

Air cargo law traces its roots to the Warsaw Convention, signed on 12 October 1929. This foundational text established the first principles of air carrier liability at a time when commercial aviation was still in its infancy. The Warsaw Convention created a regime of presumed carrier liability with compensation ceilings expressed in gold francs.

Over the following decades, this initial framework was amended multiple times: the Hague Protocol (1955), the Guadalajara Convention (1961), and the Montreal Protocols (1975) each attempted to modernise a system increasingly ill-suited to the realities of modern air freight.

The Birth of the Montreal Convention

Faced with growing legal fragmentation, the international community adopted the Convention for the Unification of Certain Rules for International Carriage by Air on 28 May 1999, commonly known as the Montreal Convention. Entering into force on 4 November 2003, it unifies and modernises the entire body of law applicable to international air transport, covering both passengers and cargo.

According to ICAO data, over 130 states have ratified the Montreal Convention, covering virtually all global air traffic. The European Union incorporated it into its legal order through Regulation (EC) No 889/2002.

Scope of Application for Air Cargo

International Transport

The Montreal Convention applies to all international air transport of cargo carried out between two states party to the Convention. The international character is determined by the places of departure and destination agreed upon in the contract of carriage, regardless of intermediate stops.

Transport Documents

The carrier is required to issue an Air Waybill (AWB) or cargo receipt. This document constitutes proof of the contract of carriage and of receipt of the goods. The Montreal Convention explicitly recognises electronic means for issuing these documents, facilitating the digitalisation of cargo operations.

Notable Exclusions

Certain operations fall outside the Convention’s scope: postal transport (governed by Universal Postal Union conventions), transport carried out in extraordinary circumstances outside normal operations, and purely domestic transport (unless it forms a leg of an international journey).

The Carrier Liability Regime

Strict Liability

The Montreal Convention establishes a regime of strict liability for the air carrier. This means the carrier is presumed liable for damage occurring while the goods are in its custody, without the shipper needing to prove fault.

Specifically, the carrier is liable for damage sustained in the event of destruction, loss, or damage to cargo, provided the event causing the damage took place during the air transport period. This period covers the time during which the cargo is in the carrier’s charge, whether at an airport, on board the aircraft, or at any place of landing.

Grounds for Exoneration

The carrier may be exonerated from liability by proving that the destruction, loss, or damage resulted from one of the following factors:

• The inherent defect, quality, or vice of the cargo
• Defective packing performed by a person other than the carrier
• An act of war or armed conflict
• An act of public authority carried out in connection with the entry, exit, or transit of the cargo

Shippers must ensure proper packaging and accurate information. A comprehensive guide to air freight packaging helps minimise risks related to this factor.

Compensation Limits and Value Declaration

The 22 SDR Per Kilogram Ceiling

The Montreal Convention sets the carrier’s liability limit at 22 Special Drawing Rights (SDR) per kilogram of cargo. The SDR is an International Monetary Fund unit of account whose value fluctuates; in 2026, 22 SDR represents approximately 27 EUR or 30 USD.

This ceiling proves insufficient for goods with high unit value: electronic components, pharmaceuticals, aerospace spare parts, or works of art.

Special Declaration of Value

To exceed the standard limits, the shipper may file a special declaration of value when handing over the goods to the carrier. This declaration, noted on the AWB, commits the carrier up to the declared amount in exchange for a supplementary charge.

Complementary Cargo Insurance

The most common solution is to purchase ad valorem cargo insurance covering the actual value of the goods. Premiums typically range from 0.3% to 1.5% of the declared value, depending on the nature of the freight, route, and carrier. Private Jets Connect systematically recommends this coverage for shipments exceeding 50,000 EUR in value.

Claim Procedures and Deadlines

Damage Inspection

Upon receiving the goods, the consignee must conduct a joint inspection in the presence of the carrier or its agent. Any apparent damage must be recorded immediately. Non-apparent damage must be protested within the legal deadlines.

Mandatory Deadlines

The Montreal Convention imposes strict deadlines, non-compliance with which results in forfeiture of the right to claim:

The protest must be addressed in writing to the carrier. Using registered post with acknowledgement of receipt or timestamped electronic communication is advisable to constitute irrefutable proof.

Jurisdictional Competence

The shipper or consignee may bring a liability action before the court of the carrier’s domicile, its principal place of business, the establishment through which the contract was concluded, or the place of destination. This jurisdictional flexibility provides a significant procedural advantage to the claimant.

Practical Implications for Cargo Chartering

Actual Carrier Liability

In the context of cargo chartering, it is crucial to distinguish between the contractual carrier (the party concluding the contract with the shipper) and the actual carrier (the party performing the transport). The Montreal Convention provides for the joint and several liability of both parties, offering enhanced protection to the shipper.

The Role of the Broker

A cargo broker such as Private Jets Connect acts as an intermediary between the shipper and the carrier. Their role is to select the most suitable operator, negotiate contractual terms, and ensure optimal legal protections. Engaging a specialised broker helps secure the entire contractual chain.

Best Practices for Shippers

To maximise the protection afforded by the Montreal Convention, shippers should adopt a rigorous approach:

• Document the nature, value, and condition of goods precisely before shipment
• Evaluate the merits of a special declaration of value for high-value consignments
• Purchase cargo insurance tailored to the risk profile
• Verify that the carrier operates between signatory states
• Retain all transport documents and photographic evidence

Recent Developments and Outlook

The Montreal Convention framework continues to evolve under the impetus of ICAO and IATA. Key trends include the full dematerialisation of the AWB through the e-Freight programme, adapting the framework to drone cargo shipments, and periodic revision of compensation ceilings to account for inflation.

The rise of cross-border e-commerce and the multiplication of high-value shipments are pushing more stakeholders to exceed the Convention’s standard limits through bespoke contractual and insurance mechanisms.

For any cargo charter project, a solid understanding of the Montreal Convention’s legal framework is a decisive asset in protecting your goods and managing your financial exposure.