My mom got it too. I think she flew two KL segments last year, both of which were booked in N or E, which at the time earned no miles at all.

It is 9,000 miles for "your first 4 flights", which they confusingly choose to define as "1 flight equals 1 one-way or 1 return flight on Air France or KLM" Now that's perfectly clear, isn't it!

Johan