Originally Posted by jiejie

One more wrinkle: I am unclear on whether due to ticketing stock or whatever, if KLM actually has the legal responsibility vs China Southern. If your contract of carriage was with KLM, then I would think they would be responsible to you, and then they deal with recovery directly with China Southern.

Originally Posted by dunderhead

You bought your ticket from KLM, KL ticket number...their problem if they code-share with unreliable partners. Send a strongly worded letter to KL's General Counsel, and be firm that you will follow up with the EU authorities and proceed to Small Claims Court, if your jurisdiction has such. It will be KL's responsibility to get their money back from CZ.