What happens when an airline operates a flight with additional flight code of another airline?

You may be on a codeshare flight.
Only one carrier actually operates the flight, however the other airlines marketing the flight can all add their own unique flight number to the flight for marketing purposes. KLM and Delta are a good example of a close and successful codeshare arrangement.



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With a codeshare flight, the operating carrier is the airline that flies the plane, and the marketing carrier is the partner airline that sells seats on the operating carrier's flights. You can tell which carrier is operating your flight: Next to the flight number when you book the flight.

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Flight cancellations can be caused by a variety of factors, such as bad weather, strikes, or technical issues with the aircraft. Passengers have certain rights if their flight is canceled, including the right to rebooking, a refund, or compensation under certain circumstances.

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Passengers who have experienced a disruption to their flight can claim EC 261 compensation from the airline of the specific flight. To be eligible, the flight must have departed from the EU with any airline or landed in the EU while being operated by a European airline.

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Flight Delay Compensation
All flights that are less than 1,500 km (932 miles): 250 euros ($269) per passenger, if you're delayed by at least two hours. Internal EU flights over 1,500 km: 400 euros ($430) per person, if you're delayed by at least three hours.

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