International Aviation Law and Passenger Protection: Liability for Delay, Cancellation and Denied Boarding under the Montreal Convention
Author: Prince Saini
Keywords: International Aviation Law, Montreal Convention 1999, Passenger Rights, Flight Delay, Flight Cancellation, Denied Boarding, Carriage by Air Act 1972, Airline Liability
Introduction
Air travel has made international movement faster and more accessible, but passengers can still face serious problems when a flight is delayed, cancelled or when they are denied boarding despite having a confirmed ticket. Such situations may result in missed connecting flights, business losses, additional accommodation expenses, inconvenience and disruption of travel plans.
International aviation law attempts to balance two interests: the operational requirements of airlines and the protection of passengers. One of the most important instruments in this field is the Convention for the Unification of Certain Rules for International Carriage by Air, 1999, commonly known as the Montreal Convention.
The Montreal Convention was adopted on 28 May 1999 to modernise and consolidate the earlier Warsaw Convention system. It establishes uniform rules concerning the liability of air carriers for matters such as passenger injury, baggage and delay. �
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For India, the Convention has been given the force of law through the Carriage by Air Act, 1972, particularly Section 4A and the Third Schedule. �
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However, an important distinction must be made at the outset. The Montreal Convention directly regulates damage caused by delay in international carriage, whereas specific passenger entitlements for cancellation and denied boarding may also arise from domestic or regional passenger-protection rules. In India, the Directorate General of Civil Aviation (DGCA) has prescribed separate requirements concerning denied boarding, cancellations and delays. �
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This article examines the legal framework governing these situations and explains the remedies available to passengers.
1. The Montreal Convention, 1999
The Montreal Convention seeks to create a uniform liability regime for international carriage by air. Article 1 provides that the Convention applies to international carriage of persons, baggage or cargo performed by aircraft for reward and, subject to the Convention, certain gratuitous carriage by an air transport undertaking. �
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The Convention is particularly important because international flights involve multiple legal jurisdictions. Without a common framework, a passenger’s rights could vary significantly depending upon the country involved.
The Convention therefore establishes:
circumstances in which an airline may be liable;
limits on liability for certain types of damage;
rules relating to claims;
jurisdictional provisions; and
a relatively uniform system for international air-carrier liability.
2. Position of the Montreal Convention in Indian Law
India incorporated the Montreal Convention into its domestic legal framework through amendments to the Carriage by Air Act, 1972.
Section 4A provides that the rules contained in the Third Schedule, which correspond to provisions of the Montreal Convention, have the force of law in India in relation to applicable carriage by air.
3. Liability for Flight Delay
Article 19 of the Montreal Convention
The most important provision concerning delay is Article 19.
It provides that the carrier is liable for damage caused by delay in the carriage by air of passengers, baggage or cargo. However, the carrier can avoid liability if it proves that it and its servants or agents took all measures that could reasonably be required to avoid the damage, or that it was impossible to take such measures. �
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This means that a delay does not automatically make an airline liable for every loss claimed by a passenger.
The passenger generally needs to establish:
that there was a delay;
that the delay occurred in the course of international carriage;
that damage resulted from the delay; and
the connection between the delay and the claimed damage.
The airline may then rely on the defence contained in Article 19.
Example
Suppose a passenger travels from Delhi to London and reaches London several hours later than scheduled. Because of the delay, the passenger misses a separately booked connecting train and incurs additional accommodation expenses.
Depending upon the facts and the applicable legal framework, the passenger may attempt to claim damages resulting from the delay. The airline, however, may argue that it took all reasonable measures to avoid the delay or that the circumstances made avoidance impossible.
4. Limit on Liability for Delay
Article 22(1) establishes a limit of liability for damage caused by delay in the carriage of persons.
The current Convention limit is 4,150 Special Drawing Rights (SDRs) per passenger. �
Department of Justice Canada
The SDR is an international reserve asset whose value is determined by the International Monetary Fund. Therefore, the monetary equivalent in a particular currency can change.
This limit is important because the Montreal Convention does not generally provide an unlimited right to damages for ordinary passenger delay.
5. What Counts as “Damage” from Delay?
The Convention focuses on damage caused by delay, rather than providing a fixed amount of compensation merely because a flight arrived late.
This distinction is important.
A passenger may experience:
additional hotel expenses;
additional transportation costs;
loss caused by missing an important appointment;
additional meal expenses; or
other provable financial consequences.
Whether a particular loss is recoverable depends upon the Convention, the facts of the case and the evidence establishing the connection between the delay and the claimed damage.
The Montreal Convention therefore primarily operates as a damages-based liability system, rather than simply providing a standard payment for every delay.
6. Flight Cancellation: Is It the Same as Delay?
Cancellation requires separate consideration.
A cancelled flight may ultimately cause a passenger to reach the destination late, but cancellation and delay are not automatically identical legal concepts.
The Montreal Convention’s Article 19 expressly deals with delay in carriage. It does not create a simple fixed compensation schedule for every cancelled flight.
Consequently, cancellation-related passenger rights may arise from other applicable legislation or passenger-protection regulations.
This distinction has become particularly important in jurisdictions such as the European Union, where Regulation (EC) No. 261/2004 provides specific rights concerning cancellation, denied boarding and long delays.
In Sturgeon v. Condor Flugdienst GmbH and Böck v. Air France SA, the Court of Justice of the European Union considered passenger compensation under Regulation 261/2004 and held that passengers suffering a sufficiently long delay could receive the same standardised compensation framework applicable to certain cancellation situations. �
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The decision should not, however, be treated as a direct interpretation of Article 19 of the Montreal Convention. It concerned a separate European passenger-rights regime.
7. Denied Boarding
Denied boarding occurs when a passenger who has a valid reservation and has complied with applicable requirements is not permitted to board the flight.
One common example is overbooking, where an airline sells more seats than are physically available on the aircraft based on expected passenger no-shows.
The Montreal Convention itself does not establish a comprehensive fixed compensation scheme specifically for denied boarding.
Instead, passenger rights relating to denied boarding may arise under the applicable national or regional passenger-protection rules.
In India, DGCA requirements specifically address denied boarding. The applicable Civil Aviation Requirements provide for compensation and facilities in cases involving denied boarding, cancellation and long delays, and also permit passengers to pursue grievances through the airline and the AirSewa mechanism. �
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8. Passenger Protection in India
Indian passengers are protected through a combination of:
the Carriage by Air Act, 1972;
the Montreal Convention as incorporated into the Act;
DGCA Civil Aviation Requirements;
the Passenger Charter; and
applicable consumer-protection and contractual remedies.
The Ministry of Civil Aviation’s Passenger Charter recognises passenger rights concerning situations including denied boarding, cancellation and delay. �
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For example, the DGCA framework provides for facilities such as meals and refreshments in specified circumstances and hotel accommodation where necessary. It also provides a grievance mechanism through the airline and AirSewa. �
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9. Liability for Cancellation
Cancellation may occur because of:
technical problems;
operational difficulties;
crew-related problems;
weather;
airport restrictions;
security concerns;
air-traffic restrictions; or
other circumstances affecting the airline’s ability to operate the flight.
The legal consequences depend substantially upon why the flight was cancelled and which passenger-protection rules apply.
In India, DGCA requirements distinguish between situations and prescribe compensation/facilities in specified circumstances. The applicable CAR also provides different treatment for international sectors and foreign carriers. �
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Therefore, it is incorrect to assume that every cancelled international flight automatically gives a passenger a claim for damages under Article 19 of the Montreal Convention.
10. Article 29 and the Exclusivity of the Convention
Another important provision is Article 29, titled “Basis of Claims.”
It provides that in the carriage of passengers, baggage and cargo, an action for damages, regardless of whether it is based on the Convention, contract, tort or another legal basis, must comply with the conditions and limits of liability established by the Convention. It also states that punitive, exemplary or other non-compensatory damages are not recoverable in such an action. �
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This provision is significant because it seeks to prevent passengers from avoiding the Convention’s liability framework simply by changing the legal label attached to their claim.
However, the scope of Article 29 has also generated substantial international litigation, particularly concerning the relationship between the Convention and separate consumer-protection regimes.
In International Air Transport Association v. Canadian Transportation Agency (2024), the Supreme Court of Canada held that a standardised passenger-compensation scheme could operate alongside the Montreal Convention because the scheme did not constitute an “action for damages” of the kind addressed by Article 29. �
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This demonstrates that the relationship between international carrier liability and independent passenger-protection regimes can be legally complex.
11. Case Law
1. Air France v. O.P. Srivastava
In Air France v. O.P. Srivastava (2018), the National Consumer Disputes Redressal Commission considered a passenger claim arising from delay and compensation. The Commission discussed the Montreal Convention while assessing compensation for inconvenience and harassment and awarded ₹4 lakh to each of the three complainants in the circumstances of that case. �
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Importance
The decision demonstrates how delay-related claims can also arise in consumer proceedings, although the precise interaction between consumer remedies and the Convention depends upon the nature of the claim.
2. S. Abdul Salam v. Union of India
In S. Abdul Salam v. Union of India, the Kerala High Court discussed India’s adoption and implementation of the Montreal Convention through the Carriage by Air (Amendment) Act, 2009.
The Court explained the purpose of the amended framework as providing greater uniformity and certainty in international air-carrier liability. �
Indian Kanoon
Importance
The case helps explain why India incorporated the Montreal Convention into its domestic law and how the Third Schedule operates.
3. M/s Bhagwandas B. Ramchandani v. British Airways
In M/s Bhagwandas B. Ramchandani v. British Airways (2022), the Supreme Court considered the two-year limitation framework under the Carriage by Air Act and the Convention-based rules.
The Court dealt with the effect of the statutory limitation period and clarified the importance of bringing an action within the prescribed period. �
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Importance
The case is significant for passengers because a valid claim can still fail if the applicable statutory limitation period is not respected.
4. Sturgeon v. Condor Flugdienst GmbH
The CJEU in Joined Cases C-402/07 and C-432/07, Sturgeon and Others v. Condor Flugdienst GmbH and Air France SA dealt with compensation for long flight delays under EU Regulation 261/2004. �
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Importance
The case illustrates the difference between the Montreal Convention’s damages-based approach and separate passenger-protection schemes that may provide standardised compensation.
What Should a Passenger Do After a Flight Disruption?
A passenger facing delay, cancellation or denied boarding should preserve relevant evidence.
Step 1: Keep the ticket and boarding pass
These establish the booking and travel details.
Step 2: Record the actual delay
Keep photographs or screenshots showing the scheduled and actual departure/arrival times where possible.
Step 3: Ask the airline for the reason
The reason for the delay or cancellation can become important when determining the applicable remedy.
Step 4: Preserve receipts
Keep receipts for:
accommodation;
meals;
local transportation;
alternative travel; and
other expenses directly connected with the disruption.
Step 5: Make a written complaint
The passenger should first approach the airline and clearly state the compensation or assistance being claimed.
Step 6: Use AirSewa where applicable
DGCA’s framework provides passengers with the option of raising grievances through AirSewa when the airline has not provided the required compensation or facilities. �
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Step 7: Consider legal proceedings
If the dispute remains unresolved, the passenger may consider the appropriate statutory or judicial remedy depending on the nature of the claim.
13. Practical Problems in Passenger Protection
Despite the existence of international and domestic rules, several practical issues remain.
Lack of awareness
Many passengers do not know the difference between:
a refund;
compensation;
reimbursement of expenses; and
damages.
These are legally different concepts.
Difficulty proving loss
Article 19 focuses on damage caused by delay. Therefore, documentation becomes particularly important when a passenger seeks damages.
Multiple legal regimes
An international journey may involve:
the Montreal Convention;
the law of the country of departure;
the law of the destination;
airline conditions of carriage; and
special passenger-protection regulations.
Determining which rules apply can therefore be complicated.
Confusion between cancellation and delay
A cancelled flight may result in a passenger reaching the destination late, but the legal treatment of cancellation is not automatically identical to the treatment of delay under Article 19.
14. Is the Montreal Convention Enough to Protect Passengers?
The Montreal Convention is important because it provides a uniform international framework for carrier liability. It also prevents widely different liability rules from applying to essentially similar international carriage disputes.
At the same time, the Convention was not designed to create a complete passenger-welfare code covering every inconvenience associated with air travel.
This is why separate passenger-protection rules remain important. The Canadian Supreme Court’s 2024 decision concerning the interaction between the Montreal Convention and Canada’s passenger-protection regulations demonstrates that consumer-protection schemes may operate alongside Convention-based liability in appropriate circumstances. �
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For India, the combination of the Carriage by Air Act and DGCA requirements therefore forms an important part of the passenger-protection framework.
15. Conclusion
The Montreal Convention, 1999 plays a central role in international aviation law by creating uniform rules governing the liability of air carriers. For passengers, its most directly relevant provision concerning flight disruption is Article 19, which deals with damage caused by delay.
However, delay, cancellation and denied boarding should not be treated as legally identical situations. The Montreal Convention principally establishes a damages-based framework for delay, while specific compensation and assistance for cancellation or denied boarding may arise under separate passenger-protection legislation or regulations.
In India, the Convention has been incorporated through the Carriage by Air Act, 1972, while DGCA requirements provide additional protections relating to denied boarding, cancellation and delay. �
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Ultimately, effective passenger protection depends not only on the existence of legal rules but also on awareness, proper documentation and timely assertion of rights. A passenger who understands the distinction between Convention-based damages and regulatory compensation is in a much better position to identify the appropriate remedy after an international flight disruption.
Frequently Asked Questions
1. What is the Montreal Convention?
The Montreal Convention, 1999 is an international treaty establishing uniform rules concerning the liability of air carriers in international carriage by air.
2. Does the Montreal Convention cover flight delays?
Yes. Article 19 makes a carrier liable for damage caused by delay in the carriage by air, subject to the carrier’s defence under the Article.
3. Is every flight delay automatically compensable?
No. The passenger generally needs to establish legally recoverable damage caused by the delay, and the carrier may rely on the defence provided by Article 19.
4. Does the Montreal Convention provide fixed compensation for denied boarding?
The Convention does not establish a comprehensive fixed compensation scheme specifically for denied boarding. Such rights may arise under applicable national or regional passenger-protection rules.
5. What happens when an international flight is cancelled?
The legal remedy depends on the applicable passenger-protection rules, the reason for cancellation and the circumstances of the carriage. Cancellation should not automatically be treated as an Article 19 delay claim.
6. What is the current liability limit for passenger delay under Article 22?
The current limit for damage caused by delay in the carriage of persons is 4,150 SDR per passenger, subject to the Convention’s terms. �
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7. How does the Montreal Convention apply in India?
India gives the Montreal Convention’s relevant rules the force of law through Section 4A and the Third Schedule of the Carriage by Air Act, 1972. �
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8. Where can an Indian passenger complain about a flight disruption?
A passenger can first approach the airline. Where applicable, the DGCA framework also provides access to AirSewa for grievance redressal. �
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References
Convention for the Unification of Certain Rules for International Carriage by Air, Montreal, 28 May 1999.
The Carriage by Air Act, 1972.
Directorate General of Civil Aviation, Civil Aviation Requirements, Series M, Part IV.
Ministry of Civil Aviation, Passenger Charter of Rights.
Air France v. O.P. Srivastava (NCDRC, 2018).
S. Abdul Salam v. Union of India (Kerala High Court, 2011).
M/s Bhagwandas B. Ramchandani v. British Airways (Supreme Court of India, 2022).
Sturgeon and Others v. Condor Flugdienst GmbH and Air France SA, Joined Cases C-402/07 and C-432/07 (CJEU, 2009).
International Air Transport Association v. Canadian Transportation Agency (Supreme Court of Canada, 2024).
