Originally Posted by
woodenshoe101
That is not accurate.
It applies to European carriers at all times, but it also applies to non-European carriers on trips that depart from the EU. The fact that OP had a leg on both KL and DL on their ticket (and that KL was the original cause of the delay) is not relevant - when a EU261-qualified delay happens (on a single ticket with multiple carriers), you file with the operating carrier that got you to your final destination (DL may send the bill to KL for this one). If it had been a DL codeshare on a KL operated AMS-DTW, KL would have been the target to file with.
I can certify that this appears accurate. I am still dealing with an issue form an air france delayed flight last year but Delta was the final carrier (CDG-JFK). See the other thread over at air france. link below. We assumed we should file EU261 claim with operating carrier but in this case Delta was the final carrier. And it was a Delta marketed flight. We used Delta skymiles for the entire round JFK-CDG-SEZ.
AF 247 SEZ CDG delayed 18 hours??