Should a codeshare claim go to the seller or operator?

Check the actual operating carrier for disruption compensation and the ticket issuer for some refund steps. A marketing flight number alone may point to the wrong form.

What to check

Check whether the flights were on one ticket, what the airline offered, and whether you agreed to give up a seat or take a new flight. Small differences in those facts can change the claim path.

What to do next

Contact the operating airline while the remaining itinerary can still be changed. Keep a copy of its offer and your response.

Official sources

• European Union / Your Europe: Air passenger rights
• U.S. DOT: Refunds
• Lufthansa Group: Lufthansa Group flight irregularities