ACNL aims to ensure that slots are being used as indicated at the time of allocation in order to achieve that scarce capacity is being used in the most efficient way. ACNL will comply with the European Council Regulation 95/93 as amended to monitor the use and adherence of allocated airport slots at all Dutch level 3 coordinated airports.

EC Regulation 95/93, as amended, stipulates that the coordinator shall monitor the conformity of air carriers’ operations with the slots allocated to them. These conformity checks shall be carried out in cooperation with the managing body of the airport and other stakeholders and shall take into account the time and other relevant parameters.
Slot monitoring at coordinated airports is a continuous process designed to ensure that most effective use is made of scarce capacity, an adequate level of service quality is maintained and intentional schedule abuse is separated from the normal variations in operational performance.LES

The main objective of slot monitoring is to identify (possible) problems regarding the use of slots and seek solutions before they occur.

All procedures related to slot monitoring must be based on the principles of neutrality, transparency and non-discrimination.

For monitoring purposes the airlines involved in joint operations, code share agreements etc. are required to make sure that both codes of the flights of the carriers involved are in the airport information systems. Moreover ACNL must be informed by both carriers involved of the details of the slots involved (for example, operating flight number) and the period of the joint operation and/or code share.

It is the responsibility of the airlines to deliver the correct information to ACNL; every change must be sent to ACNL by the slot holder as a SCR (except operational changes on the day of operation).

The Human Environment and Transport Inspectorate (ILT/CAA-NL) and Airport Coordination Netherlands (ACNL) supervise slot misuse in the Netherlands. The Slot Enforcement Code (SEC) has been jointly drawn up in order to make optimum use of the available capacity at coordinated airports. The Slot Enforcement Code describes what the ILT and ACNL understand by the different forms of slot misuse, what sanctions can be imposed when and by whom. The Slot Enforcement Code clarifies and coordinates the already existing legal competences of the monitoring and enforcement bodies; it does not contain any new (legal) competences, sanctions or forms of slot misuse.