Seems KLM is sending out emails inviting people who have received one of these notifications to answer a questionnaires. This is supposed to give 500 miles.
In my case it was a gate change notification I received via email... Not exactly the best communication medium if you're not on a crackberry phone.
Dear Customer,
KLM is conducting a survey in order to further improve its service when customers experience an incident such as a cancellation or a delay...
According to our information you have recently experienced such an incident.
We would appreciate it if you could take the time to fill in the following questionnaire concerning the handling of the incident.
If you wish, you can complete the questionnaire online by using the link below:
Header
Click here to complete the survey.
Header
To thank you for completing this questionnaire before 09/03/2011, KLM will credit your Flying Blue account with 500 Miles.
Thank you for taking a few moments to help us.