Complaints with KLM
Was your flight delayed by more than 3 hours? Then you can request compensation. On the KLM website you simply fill in the application form and try to attach documents proving the delay. If your flight originated or terminated in the EU and the delay was caused by the airline and not, for example, the weather, you have a good chance that your claim will be successful. In this case, you will receive a voucher or money from KLM.

KLM Royal Dutch Airlines