The Operating Carrier Rule: Why Filing a Codeshare Claim Against the Wrong Airline Kills the Case
When a passenger buys a ticket from one airline but flies on a plane operated by another, who is actually liable for compensation? The regulation has a specific answer, and most passengers get it wrong. Filing against the wrong carrier is one of the most common procedural failures in airline compensation, and it produces immediate rejection before the merits are ever considered.
The confusion the system creates
Modern air travel routinely involves multiple airlines in a single itinerary. A passenger buys a ticket from Airline A, boards a flight numbered by Airline A, and finds that the plane is actually operated by Airline B. The ticket, the boarding pass, and the app all reference Airline A. The aircraft, the crew, and the operational responsibility belong to Airline B.
When the flight is disrupted, the passenger's natural instinct is to file the compensation claim with the airline whose ticket they bought. This is often the wrong choice. Under EU261 and UK261, compensation liability sits with the airline that actually operated the flight, not the airline whose name appears on the ticket. Filing with the wrong carrier does not just delay the claim. It produces immediate procedural rejection, wasting weeks or months before the passenger discovers the error.
This is one of the most common failures in airline compensation practice, and it is entirely avoidable if the passenger understands the distinction the regulation makes. This article explains what that distinction is, why it exists, and how to identify the correct carrier before filing.
Marketing carrier versus operating carrier
Two roles are involved in any codeshare flight. The regulation treats them differently and this difference determines who is liable.
The marketing carrier is the airline that sold the ticket. This is the airline whose flight number appears on the booking, whose name is on the ticket, whose loyalty program credits accrue, and whose brand the passenger associates with the trip. From the passenger's perspective, this is the airline they bought from.
The operating carrier is the airline that actually operates the flight. This is the airline whose aircraft is used, whose crew is on board, whose operational systems handle the flight, and whose air operator certificate authorizes the flight. From a legal and operational perspective, this is the airline responsible for actually getting the plane in the air.
For a standard non-codeshare flight, the marketing carrier and the operating carrier are the same airline. Lufthansa sells a Lufthansa ticket for a flight operated by Lufthansa. No ambiguity exists.
For codeshare flights, the two roles separate. The ticket says Lufthansa but the aircraft is operated by United Airlines. Or the ticket says British Airways but the flight is operated by Iberia. The marketing carrier and the operating carrier are different entities, and the regulation has a specific rule about which one is liable.
What EU261 and UK261 actually say
Article 2(b) of EU261 defines the operating air carrier as "an air carrier that performs or intends to perform a flight under a contract with a passenger or on behalf of another person, legal or natural, having a contract with that passenger." UK261 uses functionally identical language following the UK's retention of the framework post-Brexit.
The rest of the regulation, including all compensation and duty of care obligations, applies to the operating carrier specifically. When Article 5(1)(c) requires compensation for cancellation, the obligation runs to the operating carrier. When Article 7 sets out the compensation amounts, they are owed by the operating carrier. When Article 9 imposes duty of care, the duty is on the operating carrier.
The marketing carrier, notwithstanding its role in selling the ticket, is not the party liable for these obligations under the regulation. This is not a matter of interpretation. The regulation is explicit that operational responsibility follows the entity actually performing the flight.
The reasoning behind this rule is operational rather than commercial. The airline actually flying the aircraft is the one that made decisions about how the flight was operated. Whether reasonable measures were taken, whether the disruption was avoidable, whether extraordinary circumstances applied, and whether care was provided during the disruption are all questions about what the operating airline did. The marketing carrier, having sold the ticket, has no operational role in the flight and no direct visibility into these questions. Placing liability on the operating carrier aligns responsibility with the entity that actually has the information and the operational authority.
See: How Airline Compensation Works
Why passengers get this wrong
The passenger-facing experience of a codeshare flight actively obscures the distinction between marketing and operating carrier. Every touchpoint the passenger encounters emphasizes the marketing carrier, and the operating carrier often appears only in small print if at all.
The ticket is issued under the marketing carrier's booking system with the marketing carrier's flight number. The booking confirmation email arrives from the marketing carrier. The check-in process, whether online or at the airport, typically runs through the marketing carrier's systems. Loyalty program credits, seat selection, baggage allowances, and other pre-flight interactions are handled through the marketing carrier.
Only at the actual airport does the operating carrier become visible. The check-in counter is often the operating carrier's counter. The gate area is managed by the operating carrier's staff. The aircraft, of course, bears the operating carrier's livery. But even at this stage, the marketing carrier's flight number remains the primary reference point in the passenger's mind.
When something goes wrong, the passenger's information environment is dominated by the marketing carrier. They received the booking from the marketing carrier. They have the marketing carrier's app. They have the marketing carrier's customer service contact information. The instinct to file the claim with the marketing carrier is a natural product of this information environment.
The regulation's rule cuts against this instinct. The passenger has to know that the entity they interacted with most is not the entity legally responsible for the compensation, and has to identify and file with the entity they had less direct contact with. This is a specific piece of knowledge that most passengers do not have.
What happens when you file against the wrong carrier
Filing against the marketing carrier when the operating carrier is the liable party produces several possible outcomes, none of them favorable.
The most common outcome is procedural rejection. The marketing carrier acknowledges the filing and responds that they were not the operating carrier for the flight in question, and that the passenger should file with the operating carrier instead. This response may take days, weeks, or months, depending on the marketing carrier's processing times. During this period, the claim is not progressing on the merits at all.
A less common but worse outcome is that the marketing carrier processes the claim through its own internal systems, applies its own analysis, and issues a substantive rejection that has no legal weight because the airline had no obligation to consider the claim in the first place. This can create confusion about the actual status of the claim and can generate correspondence that has to be untangled before the correct filing can proceed.
In some cases, the marketing carrier and the operating carrier are members of the same airline group (British Airways and Iberia both belong to IAG, for example), and internal coordination between the two may or may not produce a useful outcome. Even here, the formal legal position remains that the operating carrier is the liable party, and the claim needs to be filed with them specifically.
Across all of these outcomes, the passenger loses time. In some cases, the time lost is significant enough to affect limitation periods, particularly in jurisdictions with shorter statutes of limitation. The claim itself remains valid, but the passenger is behind schedule and often frustrated by a process that seems to be producing nothing.
How to identify the operating carrier
The operating carrier can be identified before, during, or after the flight, and the method is different in each case.
Before the flight, the operating carrier is disclosed in the booking confirmation. It appears as text such as "operated by [airline name]" alongside the marketing carrier's flight information. This disclosure is required under EU consumer protection rules and appears on most booking confirmations, though sometimes in small text that is easy to miss. Passengers reviewing their booking after a disruption should look specifically for this "operated by" language.
During the flight, the operating carrier is visible at the airport. The gate area signage, the aircraft livery, the crew uniforms, and the check-in counter are all indicators of the operating carrier. If the passenger boarded through a gate marked with a different airline's branding than the one on their ticket, that gate airline is likely the operating carrier.
After the flight, the operating carrier can be identified through the boarding pass (which often notes the operating carrier separately), through flight tracking services like Flightradar24 or FlightAware (which record the operating airline for every flight), and through the airline reservation systems if the passenger still has access to them.
For codeshare flights specifically, the flight number can be a hint. Many airlines use marketing flight numbers in specific ranges that are distinct from their operational flight numbers. A British Airways flight number that does not match the airline's usual operational patterns may indicate a codeshare arrangement.
When in doubt, the operating carrier can be confirmed by cross-referencing the flight number and route on any flight tracking service. The tracked airline is the operating carrier for compensation purposes.
Related complications: interline, wet lease, and franchise
Codeshare is the most common form of separation between marketing and operating carriers, but several related arrangements produce similar complications.
Interline agreements allow airlines to sell tickets that include segments operated by other airlines without the formal codeshare designation. These are especially common for connecting flights involving smaller regional carriers. The operating carrier for each segment is the liable party for that specific segment.
Wet lease arrangements involve one airline leasing an aircraft, complete with crew, from another airline. The flight is marketed and operated under the leasing airline's brand, but the actual aircraft and crew belong to the lessor. Under EU261, the leasing airline (the one whose brand the flight operates under) is generally treated as the operating carrier for compensation purposes, though the specific legal analysis can vary.
Franchise arrangements allow regional carriers to operate under a major airline's brand while maintaining their separate legal existence. British Airways Cityflyer, for example, operates flights under British Airways branding while being a separate airline. The franchise operator is the operating carrier for compensation purposes, even though the passenger experience is designed to be indistinguishable from the parent brand.
For each of these arrangements, the underlying principle is the same. The airline that actually performs the flight is the liable party. The airline whose brand the passenger encountered is often not. When these arrangements are involved, identifying the correct liable carrier requires more careful investigation than a standard codeshare, but the analytical framework is unchanged.
A concrete example
A specific case illustrates the operating carrier rule in practice. A passenger booked a flight from Lima to Madrid through British Airways. The booking confirmation, the ticket, and the loyalty account all referenced British Airways. The flight number was in the British Airways series.
The flight itself was operated by Iberia. This was disclosed in the booking confirmation as "operated by Iberia," in text that was easy to miss but present. The aircraft was Iberia's, the crew was Iberia's, and the check-in counter at Lima airport was Iberia's.
When the flight was disrupted, the correct filing was with Iberia, not with British Airways. The passenger's contract of carriage was with British Airways as the marketing carrier, but the operational responsibility and the EU261 compensation liability sat with Iberia as the operating carrier.
Filing with Iberia produced a substantive response, initially a rejection. Filing with British Airways would have produced procedural bouncing between the two airlines, with British Airways redirecting to Iberia and no progress on the underlying claim. The distinction determined whether the claim was moving forward or stuck in an administrative loop.
For codeshare claims within airline groups (British Airways and Iberia both belong to IAG), there is sometimes an expectation that filing with either airline should be sufficient. This expectation is not correct under the regulation. The operating carrier remains the specifically liable party regardless of corporate group relationships.
See: What to Do in the First 48 Hours After a Flight Disruption
Practical guidance
For passengers whose flights have been disrupted, several practical steps ensure the claim is filed correctly.
Review the booking confirmation carefully. Look specifically for "operated by" language. This is the definitive source for identifying the operating carrier and it is available immediately after booking.
Check the boarding pass. Boarding passes for codeshare flights often disclose the operating carrier separately from the marketing carrier. If the boarding pass shows two airlines, the second is typically the operating carrier.
Verify through flight tracking services. For any flight that has already occurred, services like Flightradar24 and FlightAware record the operating airline. Cross-referencing the flight number and route confirms which airline actually operated the flight.
File with the operating carrier only. Once the operating carrier is identified, direct the compensation claim to that carrier's customer relations department. Do not file with the marketing carrier at all, even if the marketing carrier's contact information is more accessible or the passenger has an existing relationship with them.
Keep documentation of the codeshare relationship. For any claim involving codeshare flights, preserving the booking confirmation showing the "operated by" disclosure is important. This documents that the passenger identified the correct carrier and provides evidence if the operating carrier attempts to redirect responsibility to the marketing carrier (which they occasionally try to do, though the regulation is clear that they are the liable party).
Do not accept redirection between carriers. If the operating carrier attempts to redirect the claim back to the marketing carrier, or vice versa, the passenger's position under the regulation is that the operating carrier is liable. This is not negotiable and does not require the passenger to file elsewhere.
Bigger picture
The operating carrier rule is a specific technical feature of EU261 and UK261 that creates one of the most consistent procedural failures in airline compensation practice. Passengers file with the wrong airline because the passenger experience is dominated by the marketing carrier, and they lose time, effort, and sometimes claims as a result.
The rule itself is defensible on operational grounds. The airline that actually flew the flight is the airline that made the operational decisions relevant to the compensation analysis. Placing liability with the operating carrier aligns responsibility with information and authority, which is generally the right structure for a regulatory scheme.
But the passenger-facing consequence is significant. The regulation places a technical burden on passengers that is not intuitive and not well-disclosed by airlines. The airlines involved in codeshare arrangements benefit from this confusion in several ways: passenger claims are misdirected, delays and procedural rejections reduce the volume of claims that get through, and the burden of understanding the operating carrier rule falls on the party least equipped to bear it.
Understanding this rule before filing is one of the most valuable pieces of technical knowledge a passenger can bring to a compensation claim involving multiple airlines. It is also one of the least accessible pieces of information in the standard passenger information environment. Closing this gap is often the difference between a claim that moves forward and a claim that gets stuck at the first step.
See: What Claim Catalyst Actually Does For You
Frequently asked questions
Who is liable for compensation on a codeshare flight?
The operating carrier, meaning the airline that actually flew the aircraft, is liable for EU261 and UK261 compensation. This is often different from the marketing carrier, which is the airline whose ticket the passenger bought. Filing with the marketing carrier on a codeshare flight typically results in procedural rejection, because the marketing carrier has no legal obligation under the regulation.
How do I know which airline actually operated my flight?
The operating carrier is disclosed in the booking confirmation as "operated by [airline name]," usually in small text alongside the marketing carrier's information. It can also be verified through flight tracking services like Flightradar24 and FlightAware, which record the operating airline for every flight. The boarding pass often shows the operating carrier separately.
What if I already filed with the wrong airline?
Refile with the correct operating carrier. The original filing does not preserve any procedural position with the operating carrier, and the operating carrier's response window starts from the date of the correctly directed filing. The time lost on the incorrect filing is unrecoverable, but the underlying claim remains valid subject to the applicable limitation period.
Does it matter if the two airlines are in the same corporate group?
Yes. Corporate group relationships do not change the operating carrier rule. Even for airlines in the same group (British Airways and Iberia, both part of IAG, for example), the claim must be filed with the specific operating carrier, not with any group member. Internal coordination between group members does not substitute for filing with the correct legal entity.
Are wet lease and franchise arrangements treated the same as codeshare?
Similar but not identical. For wet lease arrangements, the airline whose brand the flight operates under is generally treated as the operating carrier. For franchise arrangements, the franchise operator (the airline actually flying) is the liable party, even though the flight appears under the parent brand. The core principle remains the same: the airline that actually performed the flight is the liable party.
Why does the regulation put liability on the operating carrier instead of the marketing carrier?
Because the operating carrier made the operational decisions relevant to the compensation analysis. Whether reasonable measures were taken, whether extraordinary circumstances applied, and whether the disruption was avoidable are all questions about what the operating airline did. Placing liability with the entity that made those decisions aligns responsibility with information and operational authority.
If you have experienced a disruption on a flight where the airline that sold you the ticket was different from the airline that operated the flight, filing with the wrong carrier is one of the most common ways claims get delayed or lost. Claim Catalyst identifies the correct operating carrier at intake and files directly with the liable party. Start a claim or learn more about how airline compensation actually works in practice.