Carlos Lopez By Carlos Lopez

Flights & Travel · International

Codeshare Legal Audits: Marketing vs. Operating Carrier Liability and Transatlantic Jurisdictional Applicability

You booked with one airline. A completely different one might have actually flown the plane — and sending your claim to the wrong one is one of the most common reasons compensation requests get needlessly delayed or rejected.

The Legal Framework: What a Codeshare Actually Is

A codeshare agreement allows one airline (the marketing carrier) to sell seats under its own flight number and branding on a flight that's physically operated by a completely different airline (the operating carrier). This is extremely common on international routes through airline alliances, and most passengers never notice the distinction unless something goes wrong.

When a delay, cancellation, or denied boarding happens on a codeshare itinerary, figuring out who's actually legally liable requires identifying the operating carrier specifically — not the airline whose name is on your ticket confirmation.

The Golden Rule of Codeshare Disputes

Statutory claims for duty of care, delay compensation, and denied boarding must be directed against the OPERATING carrier physically executing the flight — not the marketing carrier that issued the ticket. This is true regardless of which airline's name and flight number appear on your booking confirmation, and regardless of who you actually paid.

The one meaningful exception to this rule involves baggage. Under Article 36 of the Montreal Convention, baggage claims on a codeshare itinerary may legally be brought against either the initial marketing carrier, the final operating carrier, or whichever carrier was performing the specific leg during which the damage, loss, or delay actually occurred — giving you somewhat more flexibility on baggage than on a delay or denied-boarding compensation claim.

The Transatlantic Jurisdictional Matrix

Which legal framework applies to a transatlantic codeshare itinerary depends on the operating carrier's country of licensing, combined with the flight's origin and destination — not on which airline sold you the ticket. Three common setups illustrate how differently this can play out:

Scenario 1: Ticketed by American Airlines, Operated by British Airways (New York JFK → London LHR)

Applicable framework: UK261 / EC261. Because British Airways — a UK/EU-licensed carrier — is the operating carrier, full UK261 distance-based compensation applies (up to £520, or the EU-side equivalent depending on departure/arrival specifics) for airline-attributable delays over 3 hours. The fact that American Airlines sold and issued the ticket is legally irrelevant to which compensation regime governs your claim.

Scenario 2: Ticketed by British Airways, Operated by American Airlines (New York JFK → London LHR)

Applicable framework: U.S. DOT regulations only — EC261/UK261 does NOT apply. This is the mirror image of Scenario 1, and it's the one that most often surprises passengers who assume booking with a UK airline guarantees UK261 protection. Since the operating carrier here is a non-EU/UK-licensed airline departing a non-EU/UK airport, you're covered strictly under U.S. DOT rules — meaning automatic refund rights if the flight is cancelled or significantly changed, but no fixed distance-based cash compensation the way EC261/UK261 would provide.

Scenario 3: Ticketed by Delta Air Lines, Operated by Air France (Paris CDG → Atlanta ATL)

Applicable framework: EC261 applies. This one has a simpler trigger: EC261 covers any flight departing an EU airport, regardless of whether the operating carrier itself is EU-based or not. Since this flight departs Paris, EC261 protection applies on that basis alone — the nationality of the operating carrier doesn't change that.

Key Action Protocol

  1. Identify the operating carrier. Check your flight confirmation or e-ticket for the phrase "Operated by [Airline Name]" — this is usually printed clearly, but easy to miss if you're not looking for it.
  2. Submit your claim to the operator, not the marketing carrier. Direct all formal claims for meals, hotels, rebooking assistance, or cash compensation to the operating carrier's own customer relations department.
  3. For baggage specifically, you have more flexibility. Under Montreal Convention Article 36, you can direct a baggage claim to the marketing carrier, the operating carrier, or whichever carrier handled the specific leg where the problem occurred — pick whichever is most practical to deal with.

Getting this wrong doesn't necessarily forfeit your claim outright, but it commonly adds weeks of delay while the marketing carrier redirects you to the operating carrier — time you can skip entirely by identifying the right carrier from the start. Generate a formal compensation letter addressed to the correct operating carrier once you've confirmed which airline actually flew the route.

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