Originally Posted by CyBeR

https://www.schiphol.nl/en/operation...urity-filters/

The relevant (first) document is in Dutch however. The second is in English but is only about how to encode 'premium' status in the barcode on the boarding pass.

Originally Posted by Google

This percentage per season (summer or winter timetable) per individual airline is calculated as follows: ( # priority boarding passes scanned by SSBPC ports / total # boarding passes scanned by SSBPC ports) * 100.
9. The maximum percentage of passengers that may be regarded as "Premium" as a "premium" applies per individual airline and may in no way be transferred to another airline.

10. Schiphol reserves the right if the number of premium passengers exceeds the capacity of the resources consulted for the number of premium passages, in deviation from Article 8 and for a certain period, the maximum proportion of 15% premium passengers lower it to another number. This lower share is communicated account

Holding with a consultation period of 4 weeks and then applies to all airlines.
Monitoring and enforcement
11. Schiphol will monitor the amount of premium passengers per airline and test against the maximum share of premium passengers that is permitted. If the number of premium passengers exceeds this maximum, Schiphol will address the relevant airline and request the number of passengers to reduce premium status.
12. To this end, the airline will submit a proposal to Schiphol and indicate how the reduction of this share will be achieved and when the airline may have implemented this. This proposal must be offered to and discussed with the Schiphol Account Manager before the start of the new timetable.
13. If the airline also lets a too high proportion of premium passengers use the "priority passage" in the following periodic measurement, then Schiphol reserves the right, whether or not, all premium passengers of the….